וַתֹּ֨אמֶר שָׂרַ֜י אֶל־אַבְרָ֗ם הִנֵּה־נָ֞א עֲצָרַ֤נִי יְהוָה֙ מִלֶּ֔דֶת בֹּא־נָא֙ אֶל־שִׁפְחָתִ֔י אוּלַ֥י אִבָּנֶ֖ה מִמֶּ֑נָּה וַיִּשְׁמַ֥ע אַבְרָ֖ם לְק֥וֹל שָׂרָֽי׃
Dijo, pues, Sarai á Abram: Ya ves que SEÑOR me ha hecho estéril: ruégote que entres á mi sierva; quizá tendré hijos de ella. Y atendió Abram al dicho de Sarai.
The Midrash of Philo
Why did Sarah say to Abraham, Behold the Lord has shut me up so that I shall not bring forth: go in now unto my handmaid so as to beget a son by her? (Genesis 16:2).
The Midrash of Philo
Why has he called Abraham's wife Sarah, for he says, Sarah the wife of Abraham, taking her handmaid Hagar the Egyptian, gave her into his hand? (Genesis 16:2).
On Mating with the Preliminary Studies
[63] We have now to the best of our ability described the mating of the reason which yearns to see and learn with the faculties both of the lawful and the concubine type. We must now continue the thread of our discourse by examining the words which follow. Abraham, it says, “hearkened to the voice of Sarah” (Gen. 16:2), for the learner must needs obey the commands of virtue.