Moses stood in the gate of the camp. We must understand "the principal gate," since the camp had several (Exodus 32:27) Who is on the Lord's side? Let him come to me. Literally, "Who for Jehovah? To me"—but expressed, as the Hebrew idiom allows, in three words, forming an excellent rallying cry.
All the sons of Levi—i.e; all who heard the cry. It is evident that there were Levites among the idolaters (Exodus 32:27, Exodus 32:29.