Malachi 3:11 (King James Bible) and I will rebuke the devourer for your sakes and he shall not destroy the fruits of your ground
The printer’s manuscript seems to be missing the and at the beginning of the second clause in this verse. The 1830 edition has the and, as does the King James reading in Malachi. And the King James and is not in italics, so there is no identifiable reason for omitting it from the Book of Mormon text. For a list of cases where scribe 2 of 𝓟 dropped the and from the text, sometimes momentarily, see under Alma 12:8.
Summary: Maintain the and that begins the second clause in 3 Nephi 24:11; the 1830 reading as well as the corresponding King James text in Malachi has this and.