Nehemiah 13:23-31 - Mixed Marriages Are Condemned
23 In those days also I saw the Jews who had married women of Ashdod, of Ammon, [and] of Moab. 24 And their sons spoke half in the speech of Ashdod, and could not speak in the Jews' language, but according to the language of each people. 25 And I contended with them, and cursed them, and smote certain of them, and plucked off their hair, and made them swear by God, [saying], Ye shall not give your daughters to their sons, nor take their daughters for your sons, or for 26 Did not Solomon king of Israel sin by these things? Yet there was no king like him among many nations, and he was beloved of his God, and God made him king over all Israel. Nevertheless foreign women caused even him to sin. 27 Shall we then hearken to you to do all this great evil, to trespass against our God in marrying foreign women?
28 And one of the sons of Joiada, the son of Eliashib the high priest, was son-in-law to Sanballat the Horonite. Therefore I chased him from me.
29 Remember them, O my God, because they have defiled the priesthood, and the covenant of the priesthood, and of the Levites.
30 Thus I cleansed them from all foreigners, and appointed charges for the priests and for the Levites, each one in his work, 31 and for the wood-offering, at times appointed, and for the first-fruits. Remember me, O my God, for good.