Moses reminded Israel of their wanderings in the wilderness, saying,
They moved from Marah and came to Elim. At Elim were twelve springs of water and seventy palm trees; so they camped there (Numbers 33.9).
Concerning the number of palm trees, this might seem incidental initially, but upon further contemplation, it cannot be.
Why would Moses tell us that there were twelve springs of water at that location and seventy palm trees?
Both twelve and seven have special meaning in the Bible, hence with God.
The reader would probably immediately think of the twelve tribes of Israel, and we know that earlier in their wanderings, seventy elders helped Moses with his work.