Where is "having known, brethren beloved, by God, your election," found in the Bible?

This verse is found in 1 Thessalonians, chapter 1, verse 4 of the Young's Literal Translation (YLT) Bible translation.

1 Thessalonians 1:4 (YLT) - Bible Verse

having known, brethren beloved, by God, your election,

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