Saraph

Indeed, if any angel dares to approach the chabod, then a saraph, i.e. one of the seraphim, immediately burns him.

He then felt the great weight of his own imperfections—but a saraph (singular for seraphim) brought Isaiah a burning coal from God’s altar, touched his lips with it, and removed the man’s sin.

God sends seraphim to attack the liberated yet ungrateful Israelites, and a saraph (singular) fashioned by Moses at God’s instruction would save them again.