Genesis 38:6 Kabbalah

וַיִּקַּ֧ח יְהוּדָ֛ה אִשָּׁ֖ה לְעֵ֣ר בְּכוֹר֑וֹ וּשְׁמָ֖הּ תָּמָֽר׃

And Judah took a wife for Er his first-born, and her name was Tamar.

Read kabbalistic (mystical) interpretation of Genesis 38:6: and classical mystical sources.