Nehemiah 13:24
And their children spake half in the speech of Ashdod, and could not speak in the Jews’ language, but according to the language of each people.
Cross-reference
Nehemiah 4:7
Historical context
In Nehemiah 4:7, Ashdodites appear as enemies opposing the wall, showing they were the foreign group whose speech infiltrated through intermarriage.
Ezra 9:2
Parallel
In Ezra 9:2, the same sin of intermarriage with foreigners defiles the holy seed, directly paralleling the mixed marriages causing language loss here.
Malachi 2:15
Contrast
Malachi 2:15 warns against marital treachery to produce godly seed, contrasting the mixed marriages here that fail to preserve a holy lineage and language.
Zephaniah 3:9
Contrast
In Zephaniah 3:9, God promises a pure language for unified worship, contrasting the mixed speech from intermarriage that loses Hebrew.