Someone recently told me that they were taught as a child that Og was the one who told Sarah about the Akeidah, causing her death. I always understood it as the Satan. Indeed, that's what Midrash Tanchuma Vayeira § 23 says (Rashi to Genesis 23:2 brings similarly, although he doesn't mention the Satan).
I looked all over and found no version of the Midrash that says it was Og, and assumed this person was mistaken. Then I found on Otzar HaChochmah the sefer Kuntres Be'er HaMegillah, which says that Chazal tell us that Og was the one who informed Sarah.
Now, either this sefer is also mistaken, or there's some Midrash that I can't find. Where, if anywhere, does it say that Og told her about the Akeidah?