Psalms 51:10

"Create in me a clean heart, O God; and renew a right spirit within me." (King James Version)

Psalm 139:23-24

New International Version

23 Search me, God, and know my heart;

test me and know my anxious thoughts.

24 See if there is any offensive way in me,

and lead me in the way everlasting.

Proverbs 4:23

New International Version

23 Above all else, guard your heart,

for everything you do flows from it.

MATTHEW 5:44

KJ21

But I say unto you, love your enemies, bless them that curse you, do good to them that hate you, and pray for them that despitefully use you and persecute you,