By faith Abraham, when he was tested, offered up Isaac: and he that had received the promises offered up his only begotten son.
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Clement Of Rome
AD 99
On account of his faith and hospitality, a son was given him in his old age; and in the exercise of obedience, he offered him as a sacrifice to God on one of the mountains which He showed him.
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)
1. Great indeed was the faith of Abraham. For while in the case of Abel, and of Noah, and of Enoch, there was an opposition of reasonings only, and it was necessary to go beyond human reasonings; in this case it was necessary not only to go beyond human reasonings, but to manifest also something more. For what was of God seemed to be opposed to what was of God; and faith opposed faith, and command promise.