Where is "`Three times thou dost keep a feast to Me in a year;" found in the Bible?

This verse is found in Exodus, chapter 23, verse 14 of the Young's Literal Translation (YLT) Bible translation.

Exodus 23:14 (YLT) - Bible Verse

`Three times thou dost keep a feast to Me in a year;

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