The Holy Quran 37:103 — Surah As-Saffat

Arabic text

فَلَمَّآ أَسْلَمَا وَتَلَّهُۥ لِلْجَبِينِ

Translation

So when the two submitted (to Allaah's command, they proceeded to carry out the sacrifice) and Ibraheem عليه الصلاة والسلام lay his son down and turned his son on his side (to slaughter him, placing the knife on the youth's throat)...

Tafsir (excerpt) — Tafsir Usmani

The great sacrifice: [he laid him face down] so that the son's face would not be before him, lest fatherly love should well up. It is said that the son taught him this. Further on Allah has not said what took place, that is, what passed over his heart and over the angels is beyond words.

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