John Gill Commentary Psalms 78:13

"He clave the sea, and caused them to pass through; And he made the waters to stand as a heap." — Psalms 78:13 (ASV)

He divided the sea
The Targum adds,

``by the rod of Moses their master;''

which he was ordered to lift up, and to stretch out his hand over the sea; which he did, and at the same time a strong east wind was raised, which caused the sea to go back, and divided the waters of it; see (Exodus 14:16Exodus 14:21)

and caused them to pass through ;
that is, he caused the Israelites to pass through the sea; this they did in faith, (Hebrews 11:29) , in the faith of the power and promise of God, and of future grace and blessings, which this was an emblem of;

for it was a representation of baptism, and is so called, (1 Corinthians 10:1 1 Corinthians 10:2) and of the sea of Christ's blood, or of his sufferings and death; whereby all enemies are overcome and destroyed, as sin and Satan, signified by the Egyptians, and salvation is wrought, and every blessing of grace procured; and of the passage of God's people through the sea of this world, and afflictions in it, safe to glory:

and he made the waters to stand as an heap ;
and were as a wall on the right hand and on the left hand so they continued until the Israelites had passed through; and then they returned, and covered the Egyptians, and drowned them, (Exodus 14:22Exodus 14:28) .