A.T. Robertson Commentary Revelation 10:5

"And the angel that I saw standing upon the sea and upon the earth lifted up his right hand to heaven," — Revelation 10:5 (ASV)

Standing (εστωτα). Second perfect active participle of ιστημ (intransitive). John resumes the picture in verse 2.

Lifted up (ηρεν). First aorist active indicative of αιρω, to lift up.

To heaven (εις τον ουρανον). Toward heaven, the customary gesture in taking a solemn oath (Genesis 14:22; Deuteronomy 32:40; Daniel 12:7).