In Ezra 10, God calls racemixing a TRESPASS against God and calls racemixxers as being GUILTY (racemixxing is when men marrying strange wives/heathen/ethnic foreigners, or vice versa on women marrying heathen/strange men):

Ezra 10:1-3, 18-19 1611 KJB
1 Now when Ezra had praised, and when he had confessed, weeping, and casting himselfe downe before the house of God, there assembled vnto him out of Israel, a very great congregation of men, and women, and children: for the people wept very sore.
2 And Shechaniah the sonne of Iehiel, one of the sonnes of Elam, answered and said vnto Ezra, Wee haue trespassed against our God, and haue taken strange wiues, of the people of the land: yet now there is hope in Israel concerning this thing.
3 Now therefore let vs make a couenant with our God, to put away all the wiues, & such as are borne of them, according to the counsell of my lord, and of those that tremble at the commandement of our God, and lee it be done according to the Law.
16 And the children of the captiuitie did so: and Ezra the Priest, with certaine chiefe of the fathers, after the house of their fathers, and all of them by their names, were separated, and sate downe in the first day of the tenth moneth to examine the matter.
17 And they made an ende, with all the men that had taken strange wiues, by the first day of the first moneth.
18 And among the sonnes of the Priestes, there were found that had taken strange wiues: namely, of the sons of Ieshua the sonne of Iozadak, and his brethren, Maasiah, and Eliezer, and Iarib, and Gedaliah.
19 And they gaue their hands, that they would put away their wiues: and being guiltie, they offered a ramme of the flocke for their trespasse.

Clearly, racemixing (which is the act of marrying strange/heathen/foreign wives) is a trespass against God (and is called that way in Scripture), and both Ezra, and the Old Testament Hebrews of Judah that racemixxed with heathen foreigner women, admitted to this biblical fact that racemixing is a trespass as recorded by Scripture.

𝕿𝖍𝖊 𝕮𝖔𝖓𝖋𝖚𝖘𝖎𝖔𝖓 𝖔𝖋 𝖙𝖍𝖊 𝕱𝖆𝖈𝖊𝖘