Tawhid, The Unity of God from the Holy Qur'an
Surah Az-Zumur, n.39
لَوْ أَرَادَ اللَّهُ أَنْ يَتَّخِذَ وَلَدًا لَاصْطَفَىٰ مِمَّا يَخْلُقُ مَا يَشَاءُ ۚ سُبْحَانَهُ ۖ هُوَ اللَّهُ الْوَاحِدُ الْقَهَّارُ
If Allah desire to take a son to Himself, He[^1] will surely choose those He pleases from what He has created. Glory be to Him: He is Allah, the One, the Subduer (of all). (39:4)
قُلِ اللَّهَ أَعْبُدُ مُخْلِصًا لَهُ دِينِي
Say: Allah (it is Whom) I serve, being sincere to Him in my obedience: (39:14)
فَاعْبُدُوا مَا شِئْتُمْ مِنْ دُونِهِ ۗ قُلْ إِنَّ الْخَاسِرِينَ الَّذِينَ خَسِرُوا أَنْفُسَهُمْ وَأَهْلِيهِمْ يَوْمَ الْقِيَامَةِ ۗ أَلَا ذَٰلِكَ هُوَ الْخُسْرَانُ الْمُبِينُ
Serve then what you like besides Him. Say: The losers surely are those who shall have lost themselves and their families on the day of resurrection; now surely that is the clear loss. (39:15)
[^1]: God would adopt one of His servants by his independent choice