Where is "thanks also to God for His unspeakable gift!" found in the Bible?

This verse is found in 2 Corinthians, chapter 9, verse 15 of the Young's Literal Translation (YLT) Bible translation.

2 Corinthians 9:15 (YLT) - Bible Verse

thanks also to God for His unspeakable gift!

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