Ibn Ezra — Isaiah 6:6

“ויעׇף Then flew. As written here, with a short kamez under ע, it is derived from עוף to fly; but ויעַף (Jud. 4:21), where the ע has a pathah, is derived from עיף to be weary. רצפה A live coal. Comp. רצפים coals (1 Kings 19:6). With tongs. As men use to do. From off the altar. Where the fire is holy, where there is no strange fire.”