Matthew 9:16-17
No man putteth a piece of new cloth on an old garment: for that which is put in to fill it; taketh from the garment and the rent is made worse.
Romans 11:6
But if by grace, then it is no more of works: else grace is no longer grace. And if it be of works, then it is no more grace; else work is no longer work.
2 Corinthians 6:14-17
Be not unequally yoked with unbelievers; for what fellowship hath righteousness with unrighteousness? or what communion hath light with darkness?
Galatians 3:9-11
So then they who are of faith are blessed with faithful Abraham. For as many as are of the works of the law are under a curse;