What does Genesis 26:5 mean?
In the previous verses, the Lord made clear to Isaac that the promises He had made to Abraham were also for Isaac (Genesis 12:1–3). The Lord would be with him and bless him. The Lord would make Isaac's descendants to be as the stars and would give to them the land of Canaan. The Lord established his oath with Isaac.Perhaps all of this sounded familiar to Isaac. The Lord had made that oath, had sworn by Himself, on the day that Abraham set out to sacrifice young Isaac on an altar in obedience to God. Abraham obeyed. The Lord stopped him and provided a ram, instead. Then the Lord made His oath to Abraham, perhaps within earshot of Isaac (Genesis 22:15–18).
At that time, the Lord had told Abraham He was making this oath because Abraham had obeyed Him. Now the Lord repeats and expands on that motivation for re-establishing these promises: because Abraham obeyed His voice, keeping His charge, His commands, His statutes, and His laws (Genesis 22:18).
Isaac would carry with Him the knowledge that all of these blessings were given by God to Him but were also secured, in part, by his father's obedience to the Lord. Abraham would continue to serve as Isaac's example.