Matthew 23:26
Ye blind Pharisee, first purify the inside of the cup, in order that its outside may be clean.
Matthew 12:33
Either make the tree good, and its fruit good; or make the tree corrupt, and its fruit corrupt: for the tree is known by the fruit.
Luke 6:45
The good man out of the good treasure of his heart brings forth the good; and the wicked man out of the wicked treasure of his heart brings forth that which is wicked: for out of the abundance of his heart his mouth speaks.
2 Corinthians 7:1
Therefore having these promises, beloved, let us cleanse ourselves from all the filthiness of the flesh and spirit, perfecting holiness in the fear of God.
Hebrews 10:22
let us draw nigh with a true heart in a full assurance of faith, having been sprinkled as to our hearts from an evil conscience,
James 4:8
draw nigh unto God, and he draws nigh unto you. Purify your hands, ye sinners; and cleanse your hearts, ye double-minded.