What does Exodus 14:19 mean?
Parting of the water is the most famous aspect of this story. However, a key component of Israel's successful crossing is depicted here. Without this step, Israel (Exodus 14:1–2) would have quickly been caught by the pursuing Egyptians (Exodus 14:5–9).This is the first reference to an angel since Moses met with the Lord at the burning bush (Exodus 3:2). There, the reference was to the "angel of the Lord," using the word YHWH or Yahweh. Here, the "angel of God" uses the term Elōhim, a more general reference. This has created some debate about the identity of this "angel." The angel is said to have gone before the Israelites, as was said earlier of God going before them in a pillar of cloud (Exodus 13:21–22). This "angel," then, might be a supernatural manifestation of God. Or perhaps the pillar is the "angel" which is moving.
Earlier verses noted clouds leading Israel during the day and fire leading them at night (Exodus 13:21–22). Here, it's clarified that there is a single column. God's leading was done by a combination of dust and fire, "fire" possibly meaning lightning. As the Egyptians approach, this will move to block their chariots (Exodus 14:5–9) from reaching the Israelites. Some interpret the following verse (Exodus 14:20) to mean that this created darkness for the Egyptians and light for the people of Israel.