John Gill Commentary Nehemiah 13:2

"because they met not the children of Israel with bread and with water, but hired Balaam against them, to curse them: howbeit our God turned the curse into a blessing." — Nehemiah 13:2 (ASV)

Because they met not the children of Israel with bread
The same reason is given, and what follows in this verse is observed in (Deuteronomy 23:4Deuteronomy 23:5) ; (See Gill on Deuteronomy 23:4) (See Gill on Deuteronomy 23:5).