مَا كَانَ لِلَّهِ أَن يَتَّخِذَ مِن وَلَدٍ ۖ سُبْحَـٰنَهُۥٓ ۚ إِذَا قَضَىٰٓ أَمْرًا فَإِنَّمَا يَقُولُ لَهُۥ كُن فَيَكُونُ Qur’an Maryam (19:35)Ma kana lillahi an yattakhitha min waladin subhanahu itha qada amran fainnama yaqoolu lahu kun fayakoonu
See note [96] on {2: 116}.
Begetting a son is a physical act depending on the needs of men's animal nature. Allah Most High is independent of all needs, and it is derogatory to Him to attribute such an act to Him. It is merely a relic of pagan and anthropomorphic materialist superstitions.