36:12ל״ו:י״ב
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ותמנע היתה פילגש. לְהוֹדִיעַ גְּדֻלָּתוֹ שֶׁל אַבְרָהָם, כַּמָּה הָיוּ תְאֵבִים לִדַּבֵּק בְּזַרְעוֹ. תִּמְנַע זוֹ בַּת אַלּוּפִים הָיְתָה, שֶׁנֶּאֱמַר וַאֲחוֹת לוֹטָן תִּמְנָע, וְלוֹטָן מֵאַלּוּפֵי יוֹשְׁבֵי שֵׂעִיר הָיָה מִן הַחוֹרִים שֶׁיָּשְׁבוּ בָהּ לְפָנִים, אָמְרָה אֵינִי זוֹכָה לְהִנָּשֵׂא לְךָ, הַלְוַאי וְאֶהְיֶה פִּילֶגֶשׁ. וּבְדִבְרֵי הַיָּמִים מוֹנֶה אוֹתָהּ בְּבָנָיו שֶׁל אֱלִיפַז, מְלַמֵּד שֶׁבָּא עַל אִשְׁתּוֹ שֶׁל שֵׂעִיר וְיָצְאָה תִּמְנָע מִבֵּינֵיהֶם, וּכְשֶׁגָּדְלָה נַעֲשֵׂית פִּילַגְשׁוֹ, וְזֶהוּ וַאֲחוֹת לוֹטָן תִּמְנָע, וְלֹא מְנָאָהּ עִם בְּנֵי שֵׂעִיר שֶׁהָיְתָה אֲחוֹתוֹ מִן הָאֵם וְלֹא מִן הָאָב:

ותמנע היתה פילגש AND TIMNA WAS CONCUBINE — This is stated to tell you in what importance Abraham was held — how eager people were to attach themselves to his descendants. This Timna was a descendant of chieftains, as it is said (v. 22) “And Lotan’s sister was Timna”, and Lotan was one of the chieftains inhabiting Seir — he was one of the Horites who had dwelt there from ancient times. She said to Eliphaz, “If I am unworthy to become your wife would that I might become your concubine!” In Chronicles (1 Chronicles 1:36) Scripture enumerates her amongst the children of Eliphaz, thus intimating that he took Seir’s wife and from the two of them Timna was born. When she grew up she became his concubine. This is why it is stated, “and Lotan’s sister was Timna”, and why Scripture does not enumerate her amongst Seir’s children, merely stating that she was sister to Lotan, Seir’s son, (see 5:20) because she was his sister from one mother and not from one father (Midrash Tanchuma, Vayeshev 1).