Surah Maryam 19:35

مَا كَانَ لِلَّهِ أَن يَتَّخِذَ مِن وَلَدٍ ۖ سُبْحَـٰنَهُۥٓ ۚ إِذَا قَضَىٰٓ أَمْرًا فَإِنَّمَا يَقُولُ لَهُۥ كُن فَيَكُونُ

It is not [befitting] for Allāh to take a son; exalted is He! When He decrees an affair, He only says to it, "Be," and it is.

Translation: Saheeh International

Tafsir

It is not befitting for God to take to Himself a son. Glory be to Him — in affirmation of His being transcendent above doing such a thing. When He decrees a thing that is when He will for it to happen He only says to it ‘Be!’ and it is read fa-yakūnu because of an implied pronoun huwa sc. fa-huwa yakūnu; …

Excerpt from Tafsir al-Jalalayn, commentary on 19:35, via Quran.com. The reader has the full commentary and 9 more tafsirs.