Fear God (phobēthēte ton theon). First aorist passive (deponent) imperative of phobeomai, here transitive with the accusative as in Luk 12:5. It is a call to judgment with no hope offered except by implication (Act 14:15.).
Give him glory (dote autōi doxan). Second aorist active indicative of didōmi. For the phrase see Rev 11:13.
The hour is come (hē hōra ēlthen). Second aorist (prophetic use) active indicative of erchomai. Common idiom in John’s Gospel (Joh 2:4; Joh 4:21, Joh 4:23; Joh 5:25, Joh 5:28; Joh 7:30, etc.).
Worship (proskunēsate). First aorist active imperative of proskuneō with the dative case. Solemn call to the pagan world to worship God as Creator (Rev 4:11; Rev 10:6), as in Psa 96:6; Act 14:15. For “the fountains of waters” see Rev 8:10.