Hebrews 10:22 (NIV)
22let us draw near to God with a sincere heart in full assurance of faith, having our hearts sprinkled to cleanse us from a guilty conscience and having our bodies washed with pure water.
James 4:8 (NIV)
8Come near to God and he will come near to you. Wash your hands, you sinners, and purify your hearts, you double-minded.
Philippians 4:8 (NIV)
8Finally, brothers, whatever is true, whatever is noble, whatever is right, whatever is pure, whatever is lovely, whatever is admirable–if anything is excellent or praiseworthy–think about such things.