1 Kings 16:21

Then were the people of Israel divided into two parts
About the succession in the kingdom:

half the people followed Tibni the son of Ginath, to make him king:
these were the friends of Zimri, or however such who did not like that the army should impose a king upon them; who this Tibni was is not said:

and half followed Omri;
the general of the army, perhaps the whole of that.