1 Timothy 3:9
"Holding the mystery of the faith in a pure conscience."
Cross References (ranked by relevance)
1 Timothy 1:19
Holding faith, and a good conscience; which some having put away concerning faith have made shipwreck:
1 Timothy 1:5
Now the end of the commandment is charity out of a pure heart, and of a good conscience, and of faith unfeigned:
1 Timothy 3:16
And without controversy great is the mystery of godliness: God was manifest in the flesh, justified in the Spirit, seen of angels, preached unto the Gentiles, believed on in the world, received up into glory.