A.T. Robertson Commentary Revelation 10:6

"and sware by him that liveth for ever and ever, who created the heaven and the things that are therein, and the earth and the things that are therein, and the sea and the things that are therein, that there shall be delay no longer:" — Revelation 10:6 (ASV)

Sware (ωμοσεν). First aorist indicative of ομνυω to swear.

By him that liveth (εν τω ζωντ). This use of εν after ομνυω instead of the usual accusative (James 5:12) is like the Hebrew (Matthew 5:34,36). "The living one for ages of ages" is a common phrase in the Apocalypse for God as eternally existing (1:18; 4:9,10; 15:7). This oath proves that this angel is not Christ.

Who created (ος εκτισεν). First aorist active indicative of κτιζω, a reference to God's creative activity as seen in Ge 1:1ff.; Exodus 20:11; Isaiah 37:16; 42:5; Psalms 33:6; 145:6, etc.

That there shall be time no longer (οτ χρονος ουκετ εστα). Future indicative indirect discourse with οτ. But this does not mean that χρονος (time), Einstein's "fourth dimension" (added to length, breadth, height), will cease to exist, but only that there will be no more delay in the fulfillment of the seventh trumpet (verse 7), in answer to the question, "How long?" (6:10).