When thou passest through the waters - This is a general promise, and means that whenever and wherever they should pass through water or fire, he would protect them. It had been true in their past history as a people; and the assurance is here given in order that they might be comforted in view of the calamities which they were then suffering in Babylon. Fire and water are often used in the Scriptures to denote calamity - the latter because it overwhelms; the former because it consumes; see Psalm 69:1 - 'The waters are come into my soul;' also Psalm 73:10; Psalm 124:4-5; Psalm 66:12 - 'We went through fire and through water.'

I will be with thee - (Compare the note at Isaiah 41:10).

And through the rivers - Also expressive of calamity and danger - like attempting to ford deep and rapid streams.

They shall not overflow thee - As was the case with the Jordan when they crossed it under the guidance of Joshua, and a pathway was made for the armies of Israel.

When thou walkest through the fire - This is expressive of calamity and danger in general like passing through fire. Yet it had a literal fulfillment in the case of the three pious Jews who were cast by Nebuchadnezzar into the burning furnace Daniel 3:25, Daniel 3:27.

Neither shall the flame kindle upon thee - It shall not only not consume thee, but it shall hog even burn, or injure thee (see Daniel 3:27). The Chaldee Paraphrase refers this verse to the passage through the Red Sea, and to the protection which God gave his people there. It is rendered, 'In the beginning, when you passed through the Red Sea, my word was your aid. Pharaoh and Egypt, who were mighty like the waters of a river, were not able to prevail against you. And when thou didst go among a people who were formidable like fire, they could not prevail against you, and the kingdoms which were strong like flame could not consume you.' It is, however, to be understood rather as a promise pertaining to the future; though the language is mainly derived, undoubtedly, from God's protecting them in their perils in former times.

When thou passest through the waters; I will be with thee,.... The Targum and Jarchi apply this to the Israelites' passage through the waters of the Red sea, as a thing past; and Kimchi to Sennacherib's army, compared to the waters of a river strong and many, Isaiah 8:7. Jerom says, that the Jewish writers by "waters" would have the Egyptians understood; by the "rivers", the Babylonians; by "fire", the Macedonians; and by the "flame", the Romans; which is not amiss; but rather the afflictions of God's people in general are meant by waters, as by rivers also, in the next clause:

and through the rivers, they shall not overflow thee; because of the variety and multitude of them, as persecutions from men, those proud waves that go over them; the temptations of Satan, that enemy who comes in like a flood, and various others; and because of the rapidity and force of them, and their overflowing and overwhelming nature: now there are paths through which the people of God pass: their way lies through them to eternal glory; and though they are of some continuance, yet have an end, as paths have; and having a good guide, and sufficient strength given them, they wade through them safely; for they do not and shall not "overflow" them, so as to cause their faith utterly to fail, or to separate them from the love of God, or so as to destroy them; for though they come nigh them, and upon them, and may greatly affect and distress them, yet shall not hurt them, but turn to their advantage; for their God is with them, to sympathize with them, to comfort and revive them, to teach and instruct them by their afflictions, and to sanctify them to them, as well as to support and bear them up under them, and to deliver out of them:

when thou walkest through the fire, thou shalt not be burnt: neither shall the flame kindle upon thee; afflictions are compared to fire and flames, because very grievous and troublesome to the flesh; and because of the apprehensions of God's wrath in them sometimes; and because of their trying nature; grace is tried by them as gold and silver in the fire; but yet the saints are not consumed by them, they lose nothing but their dross; their principles and profession are tried, and they are supported through all; which has been abundantly verified in the martyrs of Jesus; see Psalm 66:12.

When thou passest through the {c} waters, I will be with thee; and through the rivers, they shall not overflow thee: when thou walkest through the fire, thou shalt not be burned; neither shall the flame kindle upon thee.

(c) By water and fire he means all kinds of trouble and peril.

2. rivers . not overflow thee-so in passing Jordan, though at its "overflow," when its "swellings" were especially dangerous (Jos 3:15; Jer 12:5).

waters . fire-a proverbial phrase for the extremest perils (Ps 66:12; also Ps 138:7). Literally fulfilled at the Red Sea (Ex 14:21, 22), and in the case of the three youths cast into the fiery furnace for conscience' sake (Da 3:25, 27).

43:1-7 God's favour and good-will to his people speak abundant comfort to all believers. The new creature, wherever it is, is of God's forming. All who are redeemed with the blood of his Son, he has set apart for himself. Those that have God for them need not fear who or what can be against them. What are Egypt and Ethiopia, all their lives and treasures, compared with the blood of Christ? True believers are precious in God's sight, his delight is in them, above any people. Though they went as through fire and water, yet, while they had God with them, they need fear no evil; they should be born up, and brought out. The faithful are encouraged. They were to be assembled from every quarter. And with this pleasing object in view, the prophet again dissuades from anxious fears.