Revelation 16:5

Angel of the waters] As Churches (cp. Revelation 1:20), and nations and armies (cp. Revelation 9:14.), so also the elements of nature (cp. Revelation 7:1; Revelation 14:18) are in Rev. represented as having a spiritual counterpart. The exact idea occurs nowhere else in the Bible, though for what, possibly, may be approaches to it, cp. Job 4:18; Job 25:3; Job 25:5; Psalms 104:4; Isaiah 24:21; Daniel 10:13; Daniel 10:20; Matthew 18:10; Acts 12:15; Hebrews 1:7; (RV). In so poetical a book as Rev., it is difficult to decide whether these angels of water, fire, etc., are meant to be understood as real beings or merely as poetical personifications.