Commentaries:
Robertson's Word Pictures (NT)
The angel of the waters (tou aggelou ton udatwn). Genitive case object of hkousa. See Revelation 7:1 for the four angels in control of the winds and Revelation 14:18 for the angel with power over fire. The rabbis spoke also of an angel with power over the earth and another over the sea.
Which art and which wast (o wn kai o hn). See this peculiar idiom for God's eternity with o as relative before hn in Revelation 1:4, Revelation 1:8; Revelation 4:8, but without o erxomenov (the coming on, the one who is to be) there for the future as in Revelation 11:17.
Thou Holy One (o osiov). Nominative form, but vocative case, as often. Note both dikaiov and osiov applied to God as in Revelation 3:1; Revelation 15:3 f.
Because thou didst thus judge (oti tauta ekrinav). Reason for calling God dikaiov and osiov. The punishment on the waters is deserved. First aorist active indicative of krinw, to judge.
Other Robertson's Word Pictures (NT) entries containing Revelation 16:5:
Revelation 1:4
Revelation 7:1
Revelation 7:15
Revelation 11:17
Revelation 15:4
Revelation 19:11
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