Where is "take heed, then, lest the light that `is' in thee be darkness;" found in the Bible?

This verse is found in Luke, chapter 11, verse 35 of the Young's Literal Translation (YLT) Bible translation.

Luke 11:35 (YLT) - Bible Verse

take heed, then, lest the light that `is' in thee be darkness;

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