And he cried unto the LORD; and the LORD showed him a tree, which when he had cast it into the waters, the waters were made sweet: there he made for them a statute and an ordinance, and there he proved them,
All Commentaries on Exodus 15:25 Go To Exodus 15
Tertullian of Carthage
AD 220
Again, water is restored from its defect to its native grace of “sweetness” by the tree of Moses. That tree was Christ, restoring of himself the veins of what had been envenomed and bitter nature into the allsalutary waters of baptism.