Sefer Ha-yashar, or, the Book of Jasher…
“ And Abraham knew that they were not accepted before the Lord to go with them, and Abraham said to them, Abide ye here with the ass whilst I and Isaac my son will go to yonder mount and worship there before the Lord and then return to you.48 And Eliezer and Ishmael remained in that place, as Abraham had commanded.49 And Abraham took wood for a burnt offering and placed it upon his son Isaac, and he took the fire and the knife, and they both went to that place. ”
