Revelation 5:8

Having every one of them harps, and golden vials,— Harps were a principal part of the temple music: vials were also of common use in the temple service; but they were not like those small bottles which we now call vials, but like cups, or little bowls, on a plate, in allusion to the censers of God in which the priests offered incense in the temple. These censers were a sort of cups, which, because of the heat of the fire burning the incense, were often put upon a plate or saucer, something resembling a tea-cup and saucers. To offer incense to God, or before his presence in the temple, was an act of honour and religious worship peculiar to the priest's office; and the prayers of the church are often compared to it. See Psalms 141:2. So that these expressions well represent the whole heavenly church of saints and angels offering a very high act of religious worship and adoration unto Christ. Some read here, golden bowls full of perfumes.