1 Timothy 1:5; 1 Timothy 1:19; 1 Timothy 4:2

5 Now the end of the commandment is charity out of a pure heart, and of a good conscience, and of faith unfeigned:
19 Holding faith, and a good conscience; which some having put away concerning faith have made shipwreck :
2 Speaking lies in hypocrisy; having their conscience seared with a hot iron ;