Commentaries:
Robertson's Word Pictures (NT)
For (oti). Second causal conjunction (oti) explanatory of the first oti, like the two cases of oti in Revelation 15:4.
They poured out (ecexean). Second aorist active indicative of ekxew with -an instead of -on.
Blood hast thou given them to drink (aima autoiv dedwkav pein). aima (blood) is the emphatic word, measure for measure for shedding the blood of saints and prophets (Revelation 11:18; Revelation 18:24). Perfect active indicative of didwmi, and so a permanent and just punishment. Pein is the abbreviated second aorist active infinitive of pinw for piein (epion). It is the epexegetical infinitive after dedwkav. There was no more drinking-water, but only this coagulated blood.
They are worthy (acioi eisin). "Terrible antithesis" (Swete) to Revelation 3:4. The asyndeton adds to it (Alford).
Other Robertson's Word Pictures (NT) entries containing Revelation 16:6:
Revelation 3:4
Revelation 16:1
Revelation 17:6
Revelation 18:24
Revelation 22:21
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