In The Name of Allah, The Most Merciful, The Bestower of Mercy.

Allah, The Most High, said:

مَا اتَّخَذَ اللَّهُ مِن وَلَدٍ وَمَا كَانَ مَعَهُ مِنْ إِلَٰهٍ ۚ إِذًا لَّذَهَبَ كُلُّ إِلَٰهٍ بِمَا خَلَقَ وَلَعَلَا بَعْضُهُمْ عَلَىٰ بَعْضٍ ۚ سُبْحَانَ اللَّهِ عَمَّا يَصِفُونَ

No son (or offspring or children) did Allah beget, nor is there any ilah (god) along with Him; (if there had been many gods), behold, each god would have taken away what he had created, and some would have tried to overcome others! Glorified be Allah above all that they attribute to Him! [23:91]

Imam Ibn Al-Qayyim, may Allah have mercy upon him, said:

Contemplate this overwhelming proof through this short and clear statement; for indeed a true god has to be a Creator and a Performer of actions-benefiting the slaves and averting evil from them. Had it been that there was another (true) god besides (Allah), then that god would have had his own creation and actions; but (Allah) is not pleased that another god (i.e. the false gods) is associated as a partner of His. This is because (if another true god besides Allah existed) and was able to overcome Him, he would have done so. And if (such a god) was unable to overcome Him, he would have taken away what he created and depart, just as the kings of this world isolate themselves from one another when they are unable to overcome and gain authority over others. Therefore, there has to be one of the (following) three:

Either each god departs with what he has created and with his authority; or that some of them gain authority over others, or that all of them are placed under the authority of one god, who controls the affairs and they do not control His affairs, and they are restricted by His judgements but they cannot restrict Him. Therefore, Allah (alone) is the true God and they are His nurtured and subjugated slaves.

The organisation of the affairs of the world – above and below, the connection between them and their establishment upon a well-planned and perfect organisation neither clashes nor gets ruined – is the most confirmed evidence that the one in control of its affairs is One (Allah) and there no other (true) god besides Him. And just as it is impossible for the universe to have another Lord and creator, similarly, it is not possible for it to have another god that has the right to be worshipped (except Allah).

Bada’i- at-Tafseer Al-Jami Limaa Fassarahu Al-Imam Ibn Al-Qayyim Al-Jawziyyah: 1/376