And the angel of God, which went before the camp of Israel, removed and went behind them; and the pillar of the cloud went from before their face, and stood behind them:

Wesley's Notes

14:19 The angel of God - Whose ministry was made use of in the pillar of cloud and fire, went from before the camp of Israel, where they did not now need a guide; there was no danger of missing their way through the sea, and came behind them, where now they needed a guard, the Egyptians being just ready to seize the hindmost of them. There it was of use to the Israelites, not only to protect them, but to light them through the sea; and at the same time it confounded the Egyptians, so that they lost sight of their prey, just when they were ready to lay hands on it. The word and providence of God have a black and dark side towards sin and sinners, but a bright and pleasant side towards those that are Israelites indeed.

Scofield Reference Notes

Margin angel

See Scofield Note: "Heb 1:4".

Jamieson-Fausset-Brown Bible Commentary

19. the angel of God-that is, the pillar of cloud [see on [18]Ex 13:21]. The slow and silent movement of that majestic column through the air, and occupying a position behind them must have excited the astonishment of the Israelites (Isa 58:8). It was an effectual barrier between them and their pursuers, not only protecting them, but concealing their movements. Thus, the same cloud produced light (a symbol of favor) to the people of God, and darkness (a symbol of wrath) to their enemies (compare 2Co 2:16).

Matthew Henry's Concise Commentary

14:15-20 Moses' silent prayers of faith prevailed more with God than Israel's loud outcries of fear. The pillar of cloud and fire came behind them, where they needed a guard, and it was a wall between them and their enemies. The word and providence of God have a black and dark side toward sin and sinners, but a bright and pleasant side toward the people of the Lord. He, who divided between light and darkness, Ge 1:4, allotted darkness to the Egyptians, and light to the Israelites. Such a difference there will be between the inheritance of the saints in light, and that utter darkness which will be the portion of hypocrites for ever.