17 By faith Abraham, when he was tested,+ as good as offered up Isaac—the man who had gladly received the promises attempted to offer up his only-begotten son+— 18 although it had been said to him: “What will be called your offspring* will be through Isaac.”+ 19 But he reasoned that God was able to raise him up even from the dead, and he did receive him from there in an illustrative way.+

21 Was not Abraham our father declared righteous by works after he offered up Isaac his son on the altar?+