In Breishit 21:23-24, Avimelech asks Avrahm to swear that his future generations will not destroy his sons or grandchildren.

Bechor Shor commentary says:

תעשה עמדי. כשתבא לידך שלא תגרש גם אתה את זרעי:

When you posses (the land, swear) that that you will not exile my offspring.

If Avraham made this promise, how was King David, or anyone else allowed to destroy / exile the Phillistines?

  • 1
    ולניני ולנכדי. עַד כָּאן רַחֲמֵי הָאָב עַל הַבֵּן: NOR WITH MY SON NOR WITH MY SON’S SON — thus far extends a man’s pity for his descendants (Genesis Rabbah 54:2). Perhaps that's all the Bekhor Shor means by זרעי as well. – Loewian Nov 21 '19 at 14:53
  • Were all of the Philistines descendants of Avimelech? – Kinnard Hockenhull Nov 21 '19 at 17:43
  • My understanding was that it was a 2 way agreement that was broken when they messed with the wells by Yitzchak. I have no source for this, just what I assumed. – mroll Nov 21 '19 at 22:06

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