I saw in a popular book a suggestion that Avraham was born on Rosh Chodesh Tevet. Does anyone have any backing sources for this?
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1See Gemara Rosh Hashana 11a: R' Eliezer holds he was born in Tishri, R' Yehoshua holds he was born in Nissan. (Exact dates not given)– MehMar 26, 2015 at 22:09
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From Bereshit 17:26, Rashi seems to suggest that Avraham Avinu and Ishmael had the same birthday. בעצם היום הזה. שֶׁמָּלְאוּ לְאַבְרָהָם צ"ט שָׁנָה וּלְיִשְׁמָעֵאל י"ג שָׁנִים נמול אברהם וישמעאל בנו:– Eli83Oct 26, 2018 at 19:17
1 Answer
This page (it is too much to simply copy and paste) speaks of the medrashic concept that the righteous die on their birthdays [scroll down to citation 27 in the text]. As such, acknowledging that Avraham Avinu was righteous, and the gemara mentions possibilities for the Yahrzeit:
Avraham Avinu (2124 - 1638 B.C.E.:), according to some sources (Bava Basra 91a). [According to others, Avrohom Avinu's Yartzeit is 1 Tishrei, or Nissan [Moed Katan 28a].
one could work backwards and derive a birthday commensurate with the death date one accepts.
This answer deals with the sources for the yahrzeit as well.
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3I'm not seeing any mention of the date of Avraham's passing in Bava Batra 91a. Your source appears to be unreliable.– MehMar 26, 2015 at 22:07