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An Ammonite or Moabite shall not enter into the congregation of the LORD; even to their tenth generation shall they not enter into the congregation of the LORD for ever. Deuteronomy 23:3On that day they read in the book of Moses in the audience of the people; and therein was found written, that the Ammonite and the Moabite should not come into the congregation of God for ever. Nehemiah 13:1
And they took them wives of the women of Moab; the name of the one was Orpah, and the name of the other Ruth. Ruth 1:4So Boaz took Ruth, and she was his wife: and when he went in unto her, the LORD gave her conception, and she bare a son. ... and they called his name Obed: he is the father of Jesse, the father of David. Ruth 4:13-17