John 5:4

“For an angel went down at a certain season into the pool, etc.] This angel is not to be understood of a messenger sent from the sanhedrim, or by the priests, as Dr. Hammond thinks; who has a strange conceit, that this pool was used for the washing of the entrails of the sacrifices; and which at the passover being very numerous, the water in it mixed with the blood of the entrails, was possessed of an healing virtue; and which being stirred by a messenger sent from the sanhedrim for that purpose, whoever went in directly received a cure: but this angel was “an angel of the Lord”, as the Vulgate Latin, and two of Beza’s copies read; and so the Ethiopic version reads, “an angel of God”; who…”

“an angel, &c.--This miracle differed in two points from all other miracles recorded in Scripture: (1) It was not one, but a succession of miracles periodically wrought: (2) As it was only wrought "when the waters were troubled," so only upon one patient at a time, and that the patient "who first stepped in after the troubling of the waters." But this only the more undeniably fixed its miraculous character. We have heard of many waters having a medicinal virtue; but what water was ever known to cure instantaneously a single disease? And who ever heard of any water curing all, even the most diverse diseases--"blind, halt, withered"--alike? Above all, who ever heard of such a thing being done…”

“An angel - It is not affirmed that the angel did this “visibly,” or that they saw him do it. They judged by the “effect,” and when they saw the waters agitated, they concluded that they had healing properties, and descended to them. The Jews were in the habit of attributing all favors to the ministry of the angels of God, Genesis 19:15; Hebrews 1:14; Matthew 4:11; Matthew 18:10; Luke 16:22; Acts 7:53; Galatians 3:19; Acts 12:11. This fountain, it seems, had strong medicinal properties. Like many other waters, it had the property of healing certain diseases that were incurable by any other means. Thus the waters of Bath, of Saratoga, etc., are found to be highly medicinal, and to heal…”

“An angel - Yet many undoubtedly thought the whole thing to be purely natural. At certain times - Perhaps at a certain hour of the day, during this paschal week, went down - The Greek word implies that he had ceased going down, before the time of St. John's writing this. God might design this to raise expectation of the acceptable time approaching, to add a greater lustre to his Son's miracles, and to show that his ancient people were not entirely forgotten of him. The first - Whereas the Son of God healed every day not one only, but whole multitudes that resorted to him. John 5:7”

“whosoever: The sanative property of this pool has been supposed by some to have been communicated by the blood of the sacrifices, and others have referred it to the mineral properties of the waters. But: 1\. The beasts for sacrifice were not washed here, but in a laver in the temple. 2\. No natural property could cure all manner of diseases. 3\. The cure only extended to the first who entered. 4\. It took place only at one particular time. 5\. As the healing was effected by immersion, it must have been instantaneous; and it was never failing in it effects. All which, not being observed in medicinal waters, determine the cures to have been miraculous, as expressly stated in the text. first:…”