Bede

And they gave their hands, to cast out their wives, etc. First, they reject the illicit wives from themselves, and thus they offer a ram for themselves, so that, with the crime removed, they could approach the altar in purity. Indeed, it is difficult for the sacrifice of him to be accepted by God, who has not first endeavored to abandon the fault for which he offers, as Isaiah says: Cease to do evil, learn to do well (Is. 1). …

Commentary on Ezra and Nehemiah ↗