וַיְהִ֤י יִצְחָק֙ בֶּן־אַרְבָּעִ֣ים שָׁנָ֔ה בְּקַחְתּ֣וֹ אֶת־רִבְקָ֗ה בַּת־בְּתוּאֵל֙ הָֽאֲרַמִּ֔י מִפַּדַּ֖ן אֲרָ֑ם אֲח֛וֹת לָבָ֥ן הָאֲרַמִּ֖י ל֥וֹ לְאִשָּֽׁה׃
And Isaac was forty years old when he took Rebekah, the daughter of Bethuel the Aramean, of Paddan-aram, the sister of Laban the Aramean, to be his wife.
Read halakhic rulings (Jewish law) on Genesis 25:20: and classical halakhic sources.