Isaac wealthy on account of Abraham’s blessing:

” And Isaac sowed in that land and reaped in that same year a hundredfold, and Yahweh blessed him. And the man ⌊became wealthier and wealthier⌋ until he was exceedingly wealthy.”

Genesis 26:12–13 (LEB).

“And Yahweh appeared to him that night and said, “I am the God of your father Abraham. Do not be afraid, for I am with you, and I will bless you and make your descendants numerous for the sake of my servant Abraham.:

Genesis 26:24 (LEB).

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What did God promise Abraham?

“And Yahweh said to Abram, “Go out from your land and from your relatives, and from the house of your father, to the land that I will show you. 2 And I will make you a great nation, and I will bless you, and I will make your name great. And you will be a blessing.

Genesis 12:1–2 (LEB).

God promised, not to make His name Great, but Abraham’s Name, and to bless him and make him a blessing to others. (etc)

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Summary:

God: “Abraham, I will bless you, I will make you wealthy and prosperous, I will give you supernatural health, I will highly favor you in all things, I will exalt your name before the world, I will give you a son and love your children as I loved you.”

Abraham: “OK, I believe You are able.”

God points His finger at Abraham and says:

“righteousness.”

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You are part of Abraham’s blessing.

Therefore does the one who gives you the Spirit and who works miracles among you do so by the works of the law, or by the hearing of faith?

Just as Abraham believed God, and it was credited to him for righteousness, 7 then understand that the ones ⌊who have faith⌋, these are sons of Abraham. 8 And the scripture, foreseeing that God would justify the Gentiles by faith, proclaimed the good news in advance to Abraham: “In you all the nations will be blessed.” 9 So then, the ones who have faith are blessed together with Abraham who believed.

Galatians 3:5–9 (LEB)

Miracles are almost always physical and material. Isaac reaping 100 fold was a miracle

of favor in physical and material. Peter getting money from a fish’s mouth is a material miracle to pay taxes with money they did not work for. Healing for the body is a physically and material blessing. Yes, God is still sovereignly and faithfully keeping His promise that He made to his covenant friend, Abraham’s. God is sovereignly keeping His promise to bless with favor for all the children of faith.

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“God promised that Abraham would have a son, and that his descendants would become numerous like the stars. He promised that he would make his name great. It was not presented as a promise of salvation or justification as such, and it was not a call to suffering discipleship. It was a promise of healing, prosperity, and glory for Abraham. And Abraham was justified by believing in this promise. The sort of message that false teachers call heresy today has been the foundation for the calling of Moses, the coming of Christ, and the salvation of Christians. Abraham recognized that his own body and his wife’s body were old and barren, but because God said that he would have a son, natural circumstances became irrelevant. He believed that God was able to perform a miracle of healing.

It would have been redundant to believe that God was willing to do what he said. Of course he was willing — he said it. God said, “Abraham, I have made you the father of nations. You are going to have a son. I will make your name great.” Imagine if Abraham had said, “I know you are able, but are you willing to do it?” This would have made no sense, but somehow it has become a pillar in Christian reasoning. “Well…I just said you are going to have a son.” “Right, I heard you. But are you willing to do it?” Should we treat God like a child? It is even more absurd to focus on the will of God for healing given all that the Bible says about the nature of God, the work of Christ, and the ministry of the apostles and the believers. Even the attempt to demonstrate the will of God for healing seems redundant and ridiculous. Abraham believed that God was able to do this thing that was impossible for human power to accomplish. And that was faith.”

Vincent Cheung. “Healing: the Will of Man“