I am sure this is too simple.
I am sure this has been asked here many, many, many times.
Does the Church teach that we save ourselves?
No.
Are you asking, “where in Scripture is the Catholic Doctrine expressed?”
Basically, throughout. We can start with:
Exodus 15:26 He said: If you listen closely to the voice of the Lord, your God, and do what is right in his eyes: if you heed his commandments and keep all his statutes, I will not afflict you with any of the diseases with which I afflicted the Egyptians; for I, the Lord, am your healer.
Exodus 20:6 but showing love down to the thousandth generation of those who love me and keep my commandments.
Tobit 4:19At all times bless the Lord, your God, and ask him that all your paths may be straight and all your endeavors and plans may prosper. For no other nation possesses good counsel, but it is the Lord who gives all good things. Whomever the Lord chooses to raise is raised; and whomever the Lord chooses to cast down is cast down to the recesses of Hades. So now, son, keep in mind these my commandments, and never let them be erased from your heart.
John 14:15 “If you love me, you will keep my commandments.
1 John 3:24 Those who keep his commandments remain in him, and he in them, and the way we know that he remains in us is from the Spirit that he gave us.
Thank you a million times plus!
I hope that helps.