Where is "and having opened his mouth, he was teaching them, saying:" found in the Bible?

This verse is found in Matthew, chapter 5, verse 2 of the Young's Literal Translation (YLT) Bible translation.

Matthew 5:2 (YLT) - Bible Verse

and having opened his mouth, he was teaching them, saying:

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