'Envoys' in the Bible

Which sends envoys by the sea,Even in papyrus vessels on the surface of the waters.Go, swift messengers, to a nation tall and smooth,To a people feared far and wide,A powerful and oppressive nationWhose land the rivers divide.

“You have journeyed to the king with oilAnd increased your perfumes;You have sent your envoys a great distanceAnd made them go down to Sheol.