And Abraham's works to receive God's promise weren't accomplished until he obeyed God's command to sacrifice Isaac.
Genesis 22
12 He
said, "Do not
stretch out your
hand against the
lad, and
do nothing * to him; f
or now I know that you fear God, since you have not
withheld your
son, your
only son, from Me."
16 and
said, "By Myself I have
sworn,
declares the
LORD,
because * you have
done this thing and have not
withheld your
son, your
only son,
17 indeed I will
greatly bless you, and I will
greatly multiply your
seed as the
stars of the
heavens and as the
sand which is on the
seashore *; and your
seed shall
possess the
gate of their
enemies.
18 "In your
seed all the
nations of the
earth shall be
blessed,
because * you have
obeyed My
voice."
Abraham was granted righteousness through believing but there was still works to do. None of which could have been accomplished without God's Spirit to lead him.
He received the Promise in chapter 15 and believed God.
Genesis 15: NASB
1After these things the word of the LORD came to Abram in a vision, saying,
“Do not fear, Abram,
I am a shield to you;
Your reward shall be very great.”
2Abram said, “O Lord GOD, what will You give me, since I am childless, and the heir of my house is Eliezer of Damascus?”
3And Abram said, “Since You have given no offspring to me, one born in my house is my heir.”
4Then behold, the word of the LORD came to him, saying, “This man will not be your heir; but one who will come forth from your own body, he shall be your heir.”
5And He took him outside and said, “Now look toward the heavens, and count the stars, if you are able to count them.” And He said to him, “So shall your descendants be.”
6Then he believed in the LORD; and He reckoned it to him as righteousness.
7And He said to him, “I am the LORD who brought you out of Ur of the Chaldeans, to give you this land to possess it.”
8He said, “O Lord GOD, how may I know that I will possess it?”
9So He said to him, “Bring Me a three year old heifer, and a three year old female goat, and a three year old ram, and a turtledove, and a young pigeon.”
10Then he brought all these to Him and cut them in two, and laid each half opposite the other; but he did not cut the birds.
11The birds of prey came down upon the carcasses, and Abram drove them away. (NASB)
Paul goes to painful detail pointing this out in Romans 4.
Romans 4 NASB