When Israel. Compare Exodus 13:3 .
Egypt. Not Babylon. The Psalm not post-exilic.
Jacob. See notes on Genesis 32:28 ; Genesis 43:6 ; Genesis 46:27 , Genesis 46:28 .

was = became. See note on Genesis 1:2 .

The sea. Compare Exodus 14:21 .
Jordan. Compare Joshua 3:13 .

What. ? Figure of speech Erotesis. App-6 .

the Lord. Hebrew Adon. App-4 .
GOD. Hebrew Eloah. App-4 .

turned = changed.
standing = pool.