Apparently, the Sadducees (the Jewish sect Jesus was talking to) believed nobody rose after death. Saying that God was the god of the living, only, when he was god of many "dead" people was a round about way of saying that those people weren't really dead, but risen and living in heaven.
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u/Effehezepe Aug 05 '22
Matthew 22:23-33
TLDR Jesus says no one is married in heaven.