By the way that he came, by the same he shall return: This statement repeats the one made at the end of verse 28, but the structure is altered here and third person singular pronouns are used in place of the more direct second person singular pronouns because Yahweh is now addressing Hezekiah rather than Sennacherib. However, the inverted structure in this verse may not be natural in other languages. In such cases it will be better to say “He shall return by the same way he came” (New American Bible).

And he shall not come into this city: See verse 32. The conjunction and may be misleading since it does not introduce a separate idea. Rather, what follows is a reaffirmation of the idea before it. So it may be better to omit the conjunction in many languages.

Says the LORD: The repetition of this formula at this point may seem unnecessarily redundant, but it is a common way of stressing the fact that the message comes from the LORD. In some cases this clause will be more appropriate as a separate sentence as in Good News Translation. Contemporary English Version seeks to express the meaning of this clause by beginning the verse with the words “As surely as I am the LORD….”

Quoted with permission from Omanson, Roger L. and Ellington, John E. A Handbook on 1-2 Kings, Volume 2. (UBS Helps for Translators). New York: UBS, 2008. For this and other handbooks for translators see here .