By faith Abraham, when he was tested, offered up Isaac: and he that had received the promises offered up his only begotten son.
All Commentaries on Hebrews 11:17 Go To Hebrews 11
George Leo Haydock
AD 1849
By faith Abraham offered up Isaac; i.e. was ready and willing to do it, when Isaac was his only son, by whom God had promised to give him a numberless progeny, but by faith he considered that God, who had miraculously given him a son, could if he pleased raise him to life again. (Witham)