37:103
فَلَمَّآ أَسْلَمَا وَتَلَّهُۥ لِلْجَبِينِ
falammā aslamā watallahu lil'jabīni
When they had both submitted to God, and he had laid his son down on the side of his face,
Then, when they had both submitted themselves (to the Will of Allâh), and he had laid him prostrate on his forehead (or on the side of his forehead for slaughtering);