Where is "we by nature Jews, and not sinners of the nations," found in the Bible?

This verse is found in Galatians, chapter 2, verse 15 of the Young's Literal Translation (YLT) Bible translation.

Galatians 2:15 (YLT) - Bible Verse

we by nature Jews, and not sinners of the nations,

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