"Was not Abraham our father justified by works, when he had offered Isaac his son upon the altar?
They where not His works, Abraham believed God,
at age 99,
Gen 17:4 As for me, behold, my covenant is with thee, and thou shalt be a father of many nations.
God made a promise to him,
problem
Gen 17:17 Then Abraham fell upon his face, and laughed, and said in his heart, Shall a child be born unto him that is an hundred years old?
and shall Sarah, that is ninety years old, bear?
Gen 18:11 Now Abraham and Sarah were old and well stricken in age; and it ceased to be with Sarah after the manner of women.
Gen 18:12 Therefore Sarah laughed within herself, saying,
After I am waxed old shall I have pleasure, my lord being old also?
Gen 21:1 And the LORD visited Sarah as he had said, and the LORD did unto Sarah as he had spoken.
Gen 21:2 For Sarah conceived, and bare Abraham a son in his old age, at the set time of which God had spoken to him.
Gen 21:3 And Abraham called the name of his son that was born unto him, whom Sarah bare to him, Isaac.
Faith is never easy, it is why it pleases God so much, to believe when everything stands against you.
Gen 22:1 And it came to pass after these things, that God
did tempt Abraham, and said unto him, Abraham: and he said, Behold, here I am.
Gen 22:2 And he said, Take now thy son, thine only son Isaac, whom thou lovest, and get thee into the land of Moriah; and offer him there for a burnt offering upon one of the mountains which I will tell thee of.
God tempts no man, He may test us not same thing, but here He is tested in His"FAITH".
So you see it was because God sent Him that He went, it was by faith He did this thing it was not of Himself, it was not his idea, it was God,
Abraham believed God and tha twas counted for righteousness.
When we believe God His works will follow, not our own.
And yet Abraham died before God fulfilled His final promise. making Him a father of many nations,
God is not slack in these things.