﴿ مَا كَانَ لِلَّهِ أَن يَتَّخِذَ مِن وَلَدٍۢ ۖ سُبْحَٰنَهُۥٓ ۚ إِذَا قَضَىٰٓ أَمْرًۭا فَإِنَّمَا يَقُولُ لَهُۥ كُن فَيَكُونُ ﴾

“It is not conceivable that God should have taken unto Himself a son: limitless is He in His glory! When He wills a thing to be, He but says unto it "Be" -and it is!”

Please check ayah 19:37 for complete tafsir.