angel of the waters - that is, presiding over the waters.
O Lord - omitted by A, B, C, Vulgate, Syriac, Coptic, and Andreas.
and shalt be - A, B, C, Vulgate, and Andreas for this clause read, “(which art and wast) holy.” The Lord is now no longer He that shall come, for He is come in vengeance and therefore the third of the three clauses found in Rev 1:4, Rev 1:8; Rev 4:8 is here and in Rev 11:17 omitted.