6:2 seraphim. This is a Hebrew word probably meaning “burning ones” (cf. the fiery serpents in Num. 21:6). Representations of angelic creatures with six wings have been discovered in the Near East by archaeologists.
covered his face. The seraphim have no glory to compare with God’s and they cannot look on Him directly.
covered his feet. This may be an indication of modesty.
flew. The seraph does the Sovereign’s will. Here it is to praise Him.