When the meat-offering was offered, i.e. the morning sacrifice; of which Exodus 29:39,40, which doubtless was attended with the solemn prayers of God's people, as the evening sacrifice unquestionably was, Acts 3:1, there being the same reason for substance for both times. At this time Elisha joined his prayers with the prayers of God's people, especially those at Jerusalem, as Elijah had done at a like time, 1 Kings 18:29; and this time God chose to answer his and their prayers, and to work this miracle, that thereby he might determine the controversy between the Israelites and the Jews, about the place and manner of worship, and give a public testimony from heaven for the Jews, and against the Israelites. There came water; miraculously produced out of some rock or vein of the earth. By the way of Edom; from those parts which were towards Edom.
Related Commentaries of 2 Kings 3:20
2 Kings 3:20
20 And it came to pass in the morning, when the meat offering was offered, that, behold, there came water by the way of Edom, and the country was filled with water.