John Gill Commentary Ezra 10:19

"And they gave their hand that they would put away their wives; and being guilty, [they offered] a ram of the flock for their guilt." — Ezra 10:19 (ASV)

Ver. 19-43. And they gave their hands that they would put away their
wives

They proposed to do it, and actually did it:

and being guilty ;
of which they were fully convinced:

they offered a ram of the flock for their trespass ;
to make atonement for it, and thereby set an example to others to do the like. Aben Ezra observes, that we do not find that the trespass offering was a mulct to such who married strange wives, and conjectures, that it was the advice of the chief men to do it.

From hence, to the end of (Ezra 10:43) , is a list of the men that had married strange wives, and put them away; those in (Ezra 10:20–22) , were priests; in (Ezra 10:23Ezra 10:24) , Levites, and those of them who were singers or porters; the rest were Israelites: and it is a very common distinction, in rabbinical writers, to distinguish the Jews into priests, Levites, and Israelites; of these we know no more than their names; some of the heads of the families may be observed in (Ezra 2:1) .