Then God said should be “Then the LORD said” (Good News Translation), for the Hebrew has only “he said,” and verse 6 identifies the speaker as “the LORD.” Put your hand back into your bosom is literally “Return your hand to your bosom.” (See verse 6 for bosom.) So he put his hand back is also literally “He returned his hand.” This repetitive sentence may be condensed to “He did so” or “He obeyed.”

And when he took it out is exactly the same as in verse 6, but here the Hebrew adds “from his bosom.” Behold is the same particle indicating surprise as in verse 6. Good News Translation expresses this in part by adding the words “this time” and contrasting this action with that in verse 6. It was restored means that his hand became “healthy” again, just as before, and the disease was gone. Like the rest of his flesh compares the “healthy” condition of his hand with “the rest of his body.”

Quoted with permission from Osborn, Noel D. and Hatton, Howard A. A Handbook on Exodus. (UBS Helps for Translators). New York: UBS, 1999. For this and other handbooks for translators see here .