“Timna was a concubine of Elifaz son of Esau, and she bore Amalek to Elifaz. These are the sons of Ada wife of Esau” (Genesis 36:12). “Timna was a concubine of Elifaz son of Esau” – Rabbi Shimon ben Yoḥai taught: Why do I [need for the verse] to expound and say: “Timna was a concubine of Elifaz son of Esau”? It is to inform us of the praiseworthiness of the household of Abraham our patriarch, to what extent the kingdoms and realms wished to cleave to him.
Who was Lotan? He was one of the rulers, as it is stated: “The chieftain of Lotan” (Genesis 36:29), and it is written: “Lotan’s sister was Timna” (Genesis 36:22). “Timna was a concubine…” She said: ‘Since I am not worthy to marry him as a wife, I will be his maidservant.’ The matters can be inferred a fortiori: If the wicked Esau, who had to his credit only one mitzva, because he honored his father, kingdoms and realms wish to cleave to him, all the more so that they would wish to cleave to the righteous Jacob, our patriarch, who fulfilled the Torah in its entirety.