John Gill, on Neh 13:1

“And on that day they read in the book of Moses in the hearing of the people: and therein was found written, that the Ammonites and the Moabites should not come in to the church of God for ever:”

“On that day,.... Not when the wall of the city was dedicated, nor quickly after; for it cannot be thought that people should be so corrupted so soon as this chapter shows; but when Nehemiah had governed them twelve years, and had been at Babylon, and was returned again, as appears from Neh 13:6, compared with Neh 2:1, they read in the book of Moses in the audience of the people; for from the time of the reading of the law by Ezra, Neh 8:1 it became a custom to read the law publicly: and therein was found written, that the Ammonite and the Moabite should not come into the congregation of the Lord; that is, be admitted to marry with any of the people of Israel; See Gill on Deu 23:3.”

Imported from an open dataset — not yet checked against the printed edition.