What does Genesis 22:5 mean?
Interpreters of this event wonder: is Abraham convinced that God will intervene to stop him from killing Isaac before the moment comes? Or, that Isaac will be brought back to life? We're never told, exactly, but what Abraham says to his servants here is a clue. He tells them that he and the boy will go, worship, and come back again. One way or another, Abraham seems to suggest that he expects Isaac to accompany him on the way back.The term translated "boy" in the ESV is from the Hebrew root word na'ar, used to refer to "youths, lads, or young men." Given the way Isaac speaks and works in this episode (Genesis 22:6–7), he's probably a teenager, acting willingly alongside his extremely elderly father.
Abraham clearly trusted God. God explicitly told Abraham that He would establish His covenant with Isaac, as an everlasting covenant for his offspring (Genesis 17:19). God had also said that it would be through Isaac that Abraham's offspring would be named (Genesis 21:12). Since Isaac had not yet had any children, God's promise meant that Isaac must live on. Abraham has seen God turn seemingly impossible situations into examples of His righteousness and faithfulness in the past. This included saving Lot, while destroying the wicked people of Sodom (Genesis 19:15–16). It certainly included the birth of Isaac, a "miracle baby" in every way (Genesis 17:17; 21:1–2).
Another clue to Abraham's thought process is given in Hebrews 11:17–19. There we're told Abraham believed God was able to raise Isaac from the dead. Whatever Abraham expected to happen next, he does not hesitate to continue to obey God's command to sacrifice the son he loved. This is not because he thinks God actually wanted a human sacrifice; rather, it is because Abraham trusts God enough to obey, even when he does not fully understand.