Hebrews 11:1, 17, 19

Now faith is the assurance (title deed, confirmation) of things hoped for (divinely guaranteed), and the evidence of things not seen [the conviction of their reality—faith comprehends as fact what cannot be experienced by the physical senses].

By faith Abraham, when he was tested [that is, as the testing of his faith was still in progress], offered up Isaac, and he who had received the promises [of God] was ready to sacrifice his only son [of promise]; [Gen 22:1-10]

For he considered [it reasonable to believe] that God was able to raise Isaac even from among the dead. [Indeed, in the sense that he was prepared to sacrifice Isaac in obedience to God] Abraham did receive him back [from the dead] figuratively speaking.