Romans 11:6

11:6 And if it is by grace, it is no longer by works, otherwise grace would no longer be grace.

Ephesians 2:9

2:9 it is not from works, so that no one can boast.

Titus 3:5

3:5 he saved us not by works of righteousness that we have done but on the basis of his mercy, through the washing of the new birth and the renewing of the Holy Spirit,