Where is "and this I say by way of concurrence -- not of command," found in the Bible?

This verse is found in 1 Corinthians, chapter 7, verse 6 of the Young's Literal Translation (YLT) Bible translation.

1 Corinthians 7:6 (YLT) - Bible Verse

and this I say by way of concurrence -- not of command,

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