Jn 8:56, Rom 4:3,9,16, Gal 3:6, James 2:23

Abraham was justified by faith in the promised Christ to come.

Gen 15:6 And he believed in the Lord; and he counted it to him for righteousness.

Jn 8:56 Your father Abraham rejoiced to see my day: and he saw it, and was glad.

Rom 4:3 For what saith the scripture? Abraham believed God, and it was counted unto him for righteousness. 9 Cometh this blessedness then upon the circumcision only, or upon the uncircumcision also? for we say that faith was reckoned to Abraham for righteousness. 16 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,

Gal 3:6 Even as Abraham believed God, and it was accounted to him for righteousness.

James 2:23 And the scripture was fulfilled which saith, Abraham believed God, and it was imputed unto him for righteousness: and he was called the Friend of God.