Here, in the highest heaven, he saw also the seraphim with their six wings. With two they cover their face, that they gaze not upon the Shekinah; and with two their feet, which, being like a calf's feet, they hide, to keep secret Israel's transgression of the golden calf. With the third pair of wings they fly and do the service of the Lord, all the while exclaiming, "Holy, holy, holy is the Lord of hosts; the whole earth is full of His glory." The wings of these angels are of prodigious size, it would take a man five hundred years to traverse their length and their breadth, as from one end of the earth to the other.