Matthew Poole and continuators on 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 countrey was filled with water.

i. e. The morning-Sacrifice: of which Exod. 29. 39, 40. which doubtless was attended with the Solemn prayers of Gods People, as the Evening-Sacrifice unquestionably was, Act. 3. 1. there being the same reason for substance for both times. At this time Elisha joyned his Prayers with the Prayers of Gods People, especially those at Ierusalem, as he had done at a like time, 1 King. 18. 29. aad this time God chose to answer his and their Prayers, and to work this Miracle, that thereby he might determine the controversie between the Israelites and Iews, about the place and manner of worship, and give a publick Testimony from Heaven for the Iews, and against the Israelites.

Miraculously produced out of some Rock or Vein of the Earth.

From those parts which were towards Edom.