Where is "having the secret of the faith in a pure conscience," found in the Bible?

This verse is found in 1 Timothy, chapter 3, verse 9 of the Young's Literal Translation (YLT) Bible translation.

1 Timothy 3:9 (YLT) - Bible Verse

having the secret of the faith in a pure conscience,

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And Moses said, I will turn aside now, and see this great sight, why the bush is not burnt.