"Rabbi Shmuel bar Nachmeni say, When Avraham Avinu saw the great number of children he had through his second and final wife, Keturah [6 children total, after the passing of his first wife, Sarah Imeinu; [o]ne ancient source states that Hagar was already dead at this time (Yov'loth 19:13)], he knew that they would be harmful to Yitzchak and therefore, Avraham sent them off to the far eastern end of the world [with gifts].
What gifts [did he give them]? R. Jeremiah b. Abba say, 'This teaches that he imparted to them [the secrets of] the unhallowed [Martial] arts.'
Avraham say to them, 'Yitzchak is my precious son. Any nation which will enslave Yitzchak and his descendants will be punished severely in Gehenom. Therefore you should all stay far away in The East. As long as B'nei Yitzchak are enslaved among the nations, remain where you are. But when you will hear that they are living safely and securely, come and serve [with] them. In this way you will merit The Shofar of Moshiakh.'
In the days of Shlomo, some of them came to serve B'nei Yisra'el, thinking that he was Melekh ha'Moshiakh. When they saw that he wasn't, they returned to The East. They will return when Moshiakh is actually revealed, may it be speedily in our days."
What gifts [did he give them]? R. Jeremiah b. Abba say, 'This teaches that he imparted to them [the secrets of] the unhallowed [Martial] arts.'
Avraham say to them, 'Yitzchak is my precious son. Any nation which will enslave Yitzchak and his descendants will be punished severely in Gehenom. Therefore you should all stay far away in The East. As long as B'nei Yitzchak are enslaved among the nations, remain where you are. But when you will hear that they are living safely and securely, come and serve [with] them. In this way you will merit The Shofar of Moshiakh.'
In the days of Shlomo, some of them came to serve B'nei Yisra'el, thinking that he was Melekh ha'Moshiakh. When they saw that he wasn't, they returned to The East. They will return when Moshiakh is actually revealed, may it be speedily in our days."
"The contrary view (that Keturah was someone other than Hagar) is advocated by Rashbam, Abraham ibn Ezra, Radak, and Ramban."
"[T]he opinion of the Talmudic doctors: B'nei Yishma'el and B'nei Keturah are kept distinct in the account of their complaints before Alexander the Macedonian (Sanh. 91a)."
"[T]he opinion of the Talmudic doctors: B'nei Yishma'el and B'nei Keturah are kept distinct in the account of their complaints before Alexander the Macedonian (Sanh. 91a)."
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