1Co 1:9 God is faithful, by whom you were called into the fellowship of his Son, Jesus Christ our Lord. Gal 3:23-29 ESV (23) Now before faith came, we were held captive under the law, imprisoned until the coming faith would be revealed. (24) So then, the law was our guardian until Christ came, in order that we might be justified by faith. (25) But now that faith has come, we are no longer under a guardian, (26) for in Christ Jesus you are all sons of God, through faith. (27) For as many of you as were baptized into Christ have put on Christ. (28) There is neither Jew nor Greek, there is neither slave nor free, there is no male and female, for you are all one in Christ Jesus. (29) And if you are Christ's, then you are Abraham's offspring, heirs according to promise. Gal 4:1-7 ESV (1) I mean that the heir, as long as he is a child, is no different from a slave, though he is the owner of everything, (2) but he is under guardians and managers until the date set by his father. (3) In the same way we also, when we were children, were enslaved to the elementary principles of the world. (4) But when the fullness of time had come, God sent forth his Son, born of woman, born under the law, (5) to redeem those who were under the law, so that we might receive adoption as sons. (6) And because you are sons, God has sent the Spirit of his Son into our hearts, crying, "Abba! Father!" (7) So you are no longer a slave, but a son, and if a son, then an heir through God. While all men are children of God in the sense that they owe their lives to him, they become his children in the intimate and loving sense of the term only by an act of God's initiating grace and the response of their own hearts.
(31) What then shall we say to these things? If God is for us, who can be against us? (32) He who did not spare his own Son but gave him up for us all, how will he not also with him graciously give us all things? (33) Who shall bring any charge against God's elect? It is God who justifies. (34) Who is to condemn? Christ Jesus is the one who died—more than that, who was raised—who is at the right hand of God, who indeed is interceding for us. (35) Who shall separate us from the love of Christ? Shall tribulation, or distress, or persecution, or famine, or nakedness, or danger, or sword? (36) As it is written, "For your sake we are being killed all the day long; we are regarded as sheep to be slaughtered." (37) No, in all these things we are more than conquerors through him who loved us. (38) For I am sure that neither death nor life, nor angels nor rulers, nor things present nor things to come, nor powers, (39) nor height nor depth, nor anything else in all creation, will be able to separate us from the love of God in Christ Jesus our Lord. When a person receives Christ as his Savior, tremendous spiritual changes take place in him. He is given a new standing before God, being accepted as righteous in God’s sight. This new standing is called “justification.” It never expires and is never lost. The new Christian is also given a new position. He is set apart for God’s own purposes to live for His glory. This new position is called sanctification and it has a way of changing us from day to day Physical man needs cleansing; So does the inner man (James 1:22-25); Jas 1:19-27