“Create in me a clean heart, O God; And renew a right spirit within me.”
Psalm 51:10 KJV
Thus saith the Lord God, ‘I will give them one heart, and I will put a new spirit within them; and I will take the stony heart out of their flesh, and will give them an heart of flesh. I will give them one heart, and one way, that they may fear Me for ever, for the good of them, and of their children after them.’ Blessed are the pure in heart: for they shall see God. Amen!
Now the end of the commandment is charity out of a pure heart, and of a good conscience, and of faith unfeigned:
1 Timothy 1:5 KJV
This is the covenant that I will make with them After those days, saith the Lord, I will put my laws into their hearts, And in their minds will I write them;
And their sins and iniquities will I remember no more.
Now where remission of these is, there is no more offering for sin.
Having therefore, brethren, boldness to enter into the holiest by the blood of Jesus,
by a new and living way, which he hath consecrated for us, through the veil, that is to say, his flesh;
and having an high priest over the house of God;
let us draw near with a true heart in full assurance of faith, having our hearts sprinkled from an evil conscience, and our bodies washed with pure water.
Let us hold fast the profession of our faith without wavering; (for he is faithful that promised;)
and let us consider one another to provoke unto love and to good works
Hebrews 10:16-24 KJV