Victorinus of Pettau

"His feet were like unto yellow brass, as if burned in a furnace." He calls the apostles His feet, who, being wrought by suffering, preached His word in the whole world; for He rightly named those by whose means the preaching went forth, feet. Whence also the prophet anticipated this, and said: "We will worship in the place where His feet have stood." Because where they first of all stood and confirmed the Church, that is, in Judea, all the saints shall assemble together, and will worship their Lord...

"And His voice as it were the voice of many waters." The many waters are understood to be many peoples, or the gift of baptism that He sent forth by the apostles, saying: "Go ye, teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost."