Romans 3:21 But now apart from the law the righteousness of God has been made known, to which the Law and the Prophets testify. 22 This righteousness is given through faith in Jesus Christ to all who believe. There is no difference between Jew and Gentile, 23 for all have sinned and fall short of the glory of God, 24 and all are justified freely by His grace through the redemption that came by Christ Jesus. 25 God presented Christ as a sacrifice of atonement, through the shedding of his blood—to be received by faith...
...27 Where, then, is boasting? It is excluded. Because of what law? The law that requires works? No, because of the law that requires faith. 28 For we maintain that a person is justified by faith apart from the works of the law.
Romans 11:6 And IF BY GRACE, THEN IT CANNOT BE BASED ON WORKS; IF IT WERE, GRACE WOULD NO LONGER BE GRACE.
Galatians 2:19 “For through the law I died to the law so that I might live for God. 20 I have been crucified with Christ and I no longer live, but Christ lives in me. The life I now live in the body, I live by faith in the Son of God, who loved me and gave himself for me. 21 I DO NOT SET ASIDE THE GRACE OF GOD, for if righteousness could be gained through the law, Christ died for nothing!”
Ephesians 2:8 FOR IT IS BY GRACE YOU HAVE BEEN SAVED, THROUGH FAITH--and this is not from yourselves, IT IS THE GIFT OF GOD--9 NOT BY WORKS, so that no one can boast.
Titus 3:4 But when the kindness and love of God our Savior appeared, 5 He saved us, not because of righteous things we had done, but because of His mercy. He saved us through the washing of rebirth and renewal by the Holy Spirit, 6 whom he poured out on us generously through Jesus Christ our Savior, 7 so that, having been justified by His grace, we might become heirs having the hope of eternal life.
I probably could have found more, but I've got a lot of other things to do today.
One other thing, though--I am well aware that Martin Luther was no saint, and he himself would have been the first to agree with that. Some of his writings are deeply troubling, especially those regarding the Jews. Most of these however were written by the old and sick Luther, in the last years of his life, and age and illness have been to known to derail even the most stable people. Luther would have been absolutely horrified if he could have looked 400 years into the future and seen the Nazis using his writings to help justify their atrocities.
Just Sayin, don't waste your time trying to use the fact that Luther was himself a sinful human being to diminish his very real accomplishments or his rediscovery of the fact--FACT--that Christians are saved by GOD'S GRACE ALONE
THROUGH FAITH ALONE
IN JESUS CHRIST ALONE.
It won't work. Trying to use Luther's imperfections to discredit this beautiful, amazing truth will fail as completely as trying to use Martin Luther King's extramarital affairs to discredit him as a man of peace. And if you want an example a bit closer to home, consider this: John Paul II was a great man, beloved all over the world and by many non-Catholics as well. I admired him deeply myself. But long before he died he knew that the Church was protecting thousands of pedophile priests and he helped protect them. It was left to Pope Benedict XVI, less well-known, less well-liked, to grapple with the worst of the problem.
Christian belief and practice until the Reformation did not contain the idea nor practice of "Sola Scriptura".