law arāda l-lahu an yattakhidha waladan la-iṣ'ṭafā mimmā yakhluqu mā yashāu sub'ḥānahu huwa l-lahu l-wāḥidu l-qahāru
Translation
If Allāh had intended to take a son, He could have chosen from what He creates whatever He willed. Exalted is He; He is Allāh, the One, the Prevailing.1340
Verse 4 of Surah Az-Zumar (39:4), a Meccan surah, is in juz 23, on page 458 of the mushaf. Read it in Arabic with its transliteration, translations and tafsir, and listen to it recited by 72 reciters.
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Tafsir of verse 4
Al-Mukhtasar
If Allah wanted to take a son, as the idolaters claim, and Allah is far above from what they say - He would have chosen whom He wants from His creation and taken him as a child. Pure and exalted is He from what these idolaters say. He is One in His essence, attributes and actions, having no partner in them, Subduer of all His creation.
If Allah had willed to take for Himself a son, He could have chosen whatever He wished from among what He creates. Glory be to Him. He is Allah, the One, the Subjugator.
Had Allâh willed to take a son (or offspring), He could have chosen whom He willed out of those whom He created. But glory be to Him! (He is above such things). He is Allâh, the One, the Irresistible1.
Notes
[1] (V.39:4) See the footnote of (V.2:116).
If Allah had willed to choose a son, He could have chosen what He would of that which He hath created. Be He Glorified! He is Allah, the One, the Absolute.
Had Allah wished to take to Himself a son, He could have chosen whom He pleased out of those whom He doth create: but Glory be to Him! (He is above such things.) He is Allah, the One, the Irresistible.
If Allah desire to take a son to Himself, He will surely choose those He pleases from what He has created. Glory be to Him: He is Allah, the One, the Subduer (of all).
If Allah had willed to take to Him a child, indeed He would have elected whatever He decided of whatever He has created. All Extolment be to Him! He is Allah, The One, The Superb Vanquisher.