Wash thyself therefore, and anoint thee, and put thy raiment upon thee, and get thee down to the floor: but make not thyself known unto the man, until he shall have done eating and drinking. 3:3
Ruth does as Naomi says, and then at midnight Boaz wakes up and finds Ruth "at his feet." He asks who she is,
and she says, "I am Ruth thine handmaid: spread therefore your skirt over thine handmaid." 3:7-9