Compare 19:35 and 3:47

19:35 · Maryam · Juz 16

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

It is not for Allah to take a son! Glory be to Him. When He decrees a matter, He simply tells it, “Be!” And it is!

3:47 · Aal-i-Imraan · Juz 3

قَالَتْ رَبِّ أَنَّىٰ يَكُونُ لِى وَلَدٌ وَلَمْ يَمْسَسْنِى بَشَرٌ ۖ قَالَ كَذَٰلِكِ ٱللَّهُ يَخْلُقُ مَا يَشَآءُ ۚ إِذَا قَضَىٰٓ أَمْرًا فَإِنَّمَا يَقُولُ لَهُۥ كُن فَيَكُونُ

Mary wondered, “My Lord! How can I have a child when no man has ever touched me?” An angel replied, “So will it be. Allah creates what He wills. When He decrees a matter, He simply tells it, ‘Be!’ And it is!