Where is "chief Magdiel, chief Iram. These `are' chiefs of Edom." found in the Bible?

This verse is found in 1 Chronicles, chapter 1, verse 54 of the Young's Literal Translation (YLT) Bible translation.

1 Chronicles 1:54 (YLT) - Bible Verse

chief Magdiel, chief Iram. These `are' chiefs of Edom.

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