Alhamdulilahi and may bless and peace be upon prophet Muhammad and his family and his companion.
Almighty Allah says:-
يَا أَيُّهَا النَّاسُ اعْبُدُوا رَبَّكُمْ الَّذِي خَلَقَكُمْ وَالَّذِينَ مِنْ قَبْلِكُمْ لَعَلَّكُمْ تَتَّقُونَ [البقرة:21]
O humanity! Worship your Lord, "Allah"Who created you and those before you, so that you may become mindful of Him[ Al baqara 21]
Almighty Allah revealed the Noble Qur’an and sent the great Messenger Muhammad bin Abdullah, to invite people to worship him alone and warn them against worshiping creatures, from the prophets, angels, sent and others Messengers with this and warned people against polytheism and sincerely commanded worship for Almighty Allah alone.
Almighty Allah says :
وَقَضَى رَبُّكَ أَلَّا تَعْبُدُوا إِلَّا إِيَّاهُ [الإسراء:23]
For your Lord has decreed that you worship none but Him
Almighty Allah says:-
وَمَا أُمِرُوا إِلَّا لِيَعْبُدُوا اللَّهَ مُخْلِصِينَ لَهُ الدِّينَ حُنَفَاءَ [البينة:5]
even though they were only commanded to worship Allah ˹alone˺ with sincere devotion to Him in all uprightness[Surah Al bayyinah 5]
وَأَنَّ الْمَسَاجِدَ لِلَّهِ فَلَا تَدْعُوا مَعَ اللَّهِ أَحَدًا [الجن:18]
The places of worship are ˹only˺ for Allah, so do not invoke anyone besides Him[ Al jinn 18]
Almighty Allah said:-
ذَلِكُمُ اللَّهُ رَبُّكُمْ لَهُ الْمُلْكُ وَالَّذِينَ تَدْعُونَ مِنْ دُونِهِ مَا يَمْلِكُونَ مِنْ قِطْمِيرٍ (١٣) إِنْ تَدْعُوهُمْ لَا يَسْمَعُوا دُعَاءَكُمْ وَلَوْ سَمِعُوا مَا اسْتَجَابُوا لَكُمْ وَيَوْمَ الْقِيَامَةِ يَكْفُرُونَ بِشِرْكِكُمْ وَلَا يُنَبِّئُكَ مِثْلُ خَبِيرٍ [فاطر:13، 14]
That is Allah your Lord! All authority belongs to Him. But those ˹idols˺ you invoke besides Him do not possess even the skin of a date stone (13)If you call upon them, they cannot hear your calls. And if they were to hear, they could not respond to you. On the Day of Judgment they will disown your worship ˹of them˺. And no one can inform you ˹O Prophet˺ like the All-Knowledgeable[ Surah faatir 13-14].
Almighty Allah also said:-
وَمَنْ أَضَلُّ مِمَّنْ يَدْعُو مِنْ دُونِ اللَّهِ مَنْ لَا يَسْتَجِيبُ لَهُ إِلَى يَوْمِ الْقِيَامَةِ وَهُمْ عَنْ دُعَائِهِمْ غَافِلُونَ (٥)وَإِذَا حُشِرَ النَّاسُ كَانُوا لَهُمْ أَعْدَاءً وَكَانُوا بِعِبَادَتِهِمْ كَافِرِينَ [الأحقاف:5-6]،
And who could be more astray than those who call upon others besides Allah—˹others˺ that cannot respond to them until the Day of Judgment, and are ˹even˺ unaware of their calls(5)And when ˹such˺ people will be gathered together, those ˹gods˺ will be their enemies and will disown their worship.[Surah Ahqaf 5-6]
قُلْ إِنَّ صَلَاتِي وَنُسُكِي وَمَحْيَايَ وَمَمَاتِي لِلَّهِ رَبِّ الْعَالَمِينَ (١٦٢) لَا شَرِيكَ لَهُ وَبِذَلِكَ أُمِرْتُ وَأَنَا أَوَّلُ الْمُسْلِمِينَ [الأنعام:162، 163]
Say, “Surely my worship, my slaughter "slaughter animals", my life, and my death are all for Allah—Lord of all worlds (162)He has no partner. So I am commanded, and so I am the first to submit. [ An'am 162-163)
Any of this nation; Because every Prophet’s conversion to Islam comes before his ummah, and the Prophet said In the authentic hadith: Almighty Allah’s right over the servants to worship Him, and not associate anything with Him, and the right of the servants over Allah not to torment someone who does not associate with him anything, and said may peace and bless be upon him : He who dies while waship for something else except Allah, he entered Hell, and he said, peace and blessings be upon him: Allah cursed the Jews and Christians who used the graves of their prophets as mosques, and in Sahih Muslim on the authority of Jaber he said: The Messenger of Allah forbade plastering the grave and sitting on it and building it.These verses and hadiths indicate the necessity of devoted worship to Allah alone, and that the Glory be to Him is the one who deserves all acts of worship, including supplication, assistance, sacrifice, vows, prayer, fasting and other acts of worship, and that spending that or something of it other than Allah is polytheism and worship to others. It is not permissible to take mosques over graves, build on them, or plaster them, and that is only because these actions are a means to exaggeration in the dead and their worship without Allah, as this happened from some ignorant people if you know this, then you must help those who fall to this call them to Allah and stand with them and protect them from those who want to transgress on them; Because that is part of the victory of the religion of Almighty Allah, and jihad for its cause, and Allah says:-
يَا أَيُّهَا الَّذِينَ آمَنُوا إِنْ تَنْصُرُوا اللَّهَ يَنْصُرْكُمْ وَيُثَبِّتْ أَقْدَامَكُمْ [محمد:7]
O believers! If you stand up for Allah, He will help you and make your steps firm.[ Surah Muhammad 7]
Almighty said:-
وَلَيَنْصُرَنَّ اللَّهُ مَنْ يَنْصُرُهُ إِنَّ اللَّهَ لَقَوِيٌّ عَزِيزٌ (٤٠) الَّذِينَ إِنْ مَكَّنَّاهُمْ فِي الْأَرْضِ أَقَامُوا الصَّلَاةَ وَآتَوُا الزَّكَاةَ وَأَمَرُوا بِالْمَعْرُوفِ وَنَهَوْا عَنِ الْمُنْكَرِ وَلِلَّهِ عَاقِبَةُ الْأُمُورِ [الحج:40، 41]Allah will certainly help those who stand up for Him. Allah is truly All-Powerful, Almighty(40)˹They are˺ those who, if established in the land by Us, would perform prayer, pay alms-tax, encourage what is good, and forbid what is evil. And with Allah rests the outcome of all affairs. [Surah Al haji 40-41]
، وقال النبي صل الله عليه وسلم:- من رأى منكم منكرا فليغيره بيده، فإن لم يستطع فبلسانه، فإن لم يستطع فبقلبه، وذلك أضعف الإيمان
And the Prophet, may God’s prayers and peace be upon him, said: - Whoever among you sees an objectionable one, let him change it by his hand, and if he is not able, then with his tongue.If he could not, then with his heart, and that weakened faith.
And also "Issa the son of Maryam" May peace be upon him said to Israel people, Almighty Allah says:
لَقَدْ كَفَرَ الَّذِينَ قَالُوا إِنَّ اللَّهَ هُوَ الْمَسِيحُ ابْنُ مَرْيَمَ ۖ وَقَالَ الْمَسِيحُ يَا بَنِي إِسْرَائِيلَ اعْبُدُوا اللَّهَ رَبِّي وَرَبَّكُمْ ۖ إِنَّهُ مَن يُشْرِكْ بِاللَّهِ فَقَدْ حَرَّمَ اللَّهُ عَلَيْهِ الْجَنَّةَ وَمَأْوَاهُ النَّارُ ۖ وَمَا لِلظَّالِمِينَ مِنْ أَنصَارٍ(المائدة - 72)
They have certainly disbelieved who say, "Allah is the Messiah, the son of Mary" while the Messiah has said, "O Children of Israel, worship Allah, my Lord and your Lord." Indeed, he who associates others with Allah - Allah has forbidden him Paradise, and his refuge is the Fire. And there are not for the wrongdoers any helpers.[Al maidah 72]
In surah lukman, lukman said to his son.
يَا بُنَيَّ لَا تُشْرِكْ بِاللَّـهِ إِنَّ الشِّرْكَ لَظُلْمٌ عَظِيم {لقمان ١٣}
And [mention, O Muhammad], when Luqman said to his son while he was instructing him, "O my son, do not associate [anything] with Allah. Indeed, association [with him] is great injustice.{Surah lukman 13}
Luqman was a righteous man who honored the neighbor, the chaste and the caterer, the worshiper of Allah, the faithful fulfilling his promise, the dear to the eyes, the cautious the tongue, the wise and the knowledgeable.And he left what was not his concern, as he was a deep consideration of matters; He prolongs silence, and speaks only with wisdom.
So he was instruct his son, my son, do not associate [anything] with Allah. Indeed, association [with him] is great injustice, he commanded his son to worship Allah glory and majesty alone, and forbade him to worship someone else, and told him that polytheism is a great injustice.
* It is injustice because it places something out of its position *It is great because of the compromise between the one who is responsible for everything "He is Allah", the Almighty, and he who has no benefit or harm, such as one who worships idols, Sheikh, River, or whoever worships Issa,"the son of Maryam" may peace be upon him and many more.
And the greatest of evils is polytheism in Allah Almighty, his means and his excuses, then heresies and sins, so you must deny what Allah has denied and forbidden, and command what Allah and His Messenger commanded, and that is the way of happiness, salvation, pride and honor in this world and the hereafter, I ask Allah to make us and you among the supporters of the truth And advocates of guidance, and from the guidance of the converted, He is Hearer, near.