A.T. Robertson Commentary Revelation 10:11

"And they say unto me, Thou must prophesy again over many peoples and nations and tongues and kings." — Revelation 10:11 (ASV)

They say (λεγουσιν). Present active of vivid dramatic action and the indefinite statement in the plural as in 13:16; 16:15. It is possible that the allusion is to the heavenly voice (10:4,8) and to the angel (10:9).

Thou must prophesy again (δε σε παλιν προφητευσα). Not a new commission (1:19), though now renewed. C.f. Ezekiel 4:7; 6:2; Jeremiah 1:10. The παλιν (again) points to what has preceded and also to what is to come in 11:15. Here it is predictive prophecy (προφητευσα, first aorist active infinitive of προφητευω).

Over (επ). In the case, in regard to as in Joh 12:16 (with γραφω), not in the presence of (επ with genitive, Mr 13:9) nor against (επ with the accusative, Luke 22:53). For this list of peoples see 5:9, occurring seven times in the Apocalypse.