According to the source-critical approach, Chayei Sara contains three segments.
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The Isaac-Ishmael-Hagar story is in chapter 21 and the Akeda is in chapter 22. Rosh Hashanah offers the opportunity to study them together.
As often as politely possible, I hide from this piece. I find as many excuses as I can to say “no thanks” to the Rabbi’s kind and humbling yearly request to sing it – not enough prep time, too much else going on, someone else can do it better (this last one is always true), etc. This year, however, I said yes.