25:6כ״ה:ו׳
1 א

הפילגשים. חָסֵר כְּתִיב, שֶׁלֹּא הָיְתָה אֶלָּא פִּלֶגֶשׁ אַחַת, הִיא הָגָר, הִיא קְטוּרָה (בראשית רבה). נָשִׁים בִּכְתֻבָּה, פִּילַגְשִׁים בְּלֹא כְּתֻבָּה, כִּדְאָמְרִינַן בְּסַנְהֶדְרִין, בְּנָשִׁים וּפִילַגְשִׁים דְּדָוִד:

הפילגשים THE CONCUBINES — The word is written deficient, (without י, but our texts have a י in both places) because he had only one concubine, Hagar, who is identical with Keturah. Wives are those whom a man marries with a marriage-contract (Ketubah): concubines have no marriage contract, as we explain in the Talmud (Sanhedrin 21a) in reference to David’s wives and concubines.

2 ב

נתן אברהם מתנות. פֵּרְשׁוּ רַבּוֹתֵינוּ שֵׁם טֻמְאָה מָסַר לָהֶם (סנהדרין צ"א). דָּ"אַ מַה שֶּׁנִּתַּן לוֹ עַל אוֹדוֹת שָׂרָה וּשְׁאָר מַתָּנוֹת שֶׁנִתְּנוּ לוֹ, הַכֹּל נָתַן לָהֶם, שֶׁלֹּא רָצָה לֵהָנוֹת מֵהֶם:

נתן אברהם מתנות ABRAHAM GAVE GIFTS — Our Rabbis explained (Sanhedrin 91a) that he transmitted to them the names of impure things. Another explanation is: all that he had received as gifts because of Sarah — and other gifts that people had given him — all these he gave to them because he did not wish to derive any benefit from these.