Genesis 38:6 Halakhah

וַיִּקַּ֧ח יְהוּדָ֛ה אִשָּׁ֖ה לְעֵ֣ר בְּכוֹר֑וֹ וּשְׁמָ֖הּ תָּמָֽר׃

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

Read halakhic rulings (Jewish law) on Genesis 38:6: and classical halakhic sources.