Genesis 38:6
"And Judah took a wife for Er his firstborn, whose name was Tamar."
Cross References (ranked by relevance)
Matthew 1:3
And Judas begat Phares and Zara of Thamar; and Phares begat Esrom; and Esrom begat Aram;
Genesis 24:3
And I will make thee swear by the LORD, the God of heaven, and the God of the earth, that thou shalt not take a wife unto my son of the daughters of the Canaanites, among whom I dwell:
Genesis 21:21
And he dwelt in the wilderness of Paran: and his mother took him a wife out of the land of Egypt.