Romans 4:16

All depends on faith, and for this reason--that acceptance with God might be an act of pure grace,

Romans 9:8

In other words, it is not the children by natural descent who count as God's children, but the children made such by the promise are regarded as Abraham's posterity.

Romans 15:8

My meaning is that Christ has become a servant to the people of Israel in vindication of God's truthfulness-- in showing how sure are the promises made to our forefathers--

Galatians 3:22

But Scripture has shown that all mankind are the prisoners of sin, in order that the promised blessing, which depends on faith in Jesus Christ, may be given to those who believe.

Romans 3:24-26

gaining acquittal from guilt by His free unpurchased grace through the deliverance which is found in Christ Jesus.

Romans 4:11

Before, not after. And he received circumcision as a sign, a mark attesting the reality of the faith-righteousness which was his while still uncircumcised, that he might be the forefather of all those who believe even though they are uncircumcised--in order that this righteousness might be placed to their credit;

Romans 5:1

Standing then acquitted as the result of faith, let us enjoy peace with God through our Lord Jesus Christ,

Galatians 3:7-12

Notice therefore that those who possess faith are true sons of Abraham.

Ephesians 2:5

caused us, dead though we were through our offences, to live with Christ--it is by grace that you have been saved--

Ephesians 2:8

For it is by grace that you have been saved through faith; and that not of yourselves. It is God's gift, and is not on the ground of merit--

Titus 3:7

in order that having been declared righteous through His grace we might become heirs to the Life of the Ages in fulfilment of our hopes.

Hebrews 6:13-19

For when God gave the promise to Abraham, since He had no one greater to swear by, He swore by Himself,

2 Peter 1:10

For this reason, brethren, be all the more in earnest to make sure that God has called you and chosen you; for it is certain that so long as you practise these things, you will never stumble.

Treasury of Scripture Knowledge

Summary

Therefore it is of faith, that it might be by grace; to the end the promise might be sure to all the seed; not to that only which is of the law, but to that also which is of the faith of Abraham; who is the father of us all,

But to

The father

Bible References

Of faith

Romans 3:24
gaining acquittal from guilt by His free unpurchased grace through the deliverance which is found in Christ Jesus.
Romans 5:1
Standing then acquitted as the result of faith, let us enjoy peace with God through our Lord Jesus Christ,
Galatians 3:7
Notice therefore that those who possess faith are true sons of Abraham.
Ephesians 2:5
caused us, dead though we were through our offences, to live with Christ--it is by grace that you have been saved--
Titus 3:7
in order that having been declared righteous through His grace we might become heirs to the Life of the Ages in fulfilment of our hopes.

The promise

Hebrews 6:13
For when God gave the promise to Abraham, since He had no one greater to swear by, He swore by Himself,
2 Peter 1:10
For this reason, brethren, be all the more in earnest to make sure that God has called you and chosen you; for it is certain that so long as you practise these things, you will never stumble.

But to

Romans 4:11
Before, not after. And he received circumcision as a sign, a mark attesting the reality of the faith-righteousness which was his while still uncircumcised, that he might be the forefather of all those who believe even though they are uncircumcised--in order that this righteousness might be placed to their credit;

The father

Romans 9:8
In other words, it is not the children by natural descent who count as God's children, but the children made such by the promise are regarded as Abraham's posterity.

General references

Luke 10:26
"Go to the Law," said Jesus; "what is written there? how does it read?"
Galatians 3:9
So we see that it is those who possess faith that are blessed with believing Abraham.
Galatians 4:28
But you, brethren, like Isaac, are children born in fulfilment of a promise.