Ruth 3:4

4. go in, and uncover his feet and lay thee down--Singular as these directions may appear to us, there was no impropriety in them, according to the simplicity of rural manners in Beth-lehem. In ordinary circumstances these would have seemed indecorous to the world; but in the case of Ruth, it was a method, doubtless conformable to prevailing usage, of reminding Boaz of the duty which devolved on him as the kinsman of her deceased husband. Boaz probably slept upon a mat or skin; Ruth lay crosswise at his feet--a position in which Eastern servants frequently sleep in the same chamber or tent with their master; and if they want a covering, custom allows them that benefit from part of the covering on their master's bed. Resting, as the Orientals do at night, in the same clothes they wear during the day, there was no indelicacy in a stranger, or even a woman, putting the extremity of this cover over her.

Robert Jamieson, A. R. Fausset & David Brown, 1871 · public domain

Verse 4 Uncover his feet, and lay thee down - It is said that women in the East, when going to the bed of their lawful husbands, through modesty, and in token of subjection, go to the bed's foot, and gently raising the clothes, creep under them up to their place. See Calmet. On the whole, we must say, had not Boaz been a person of extraordinary piety, prudence, and continence, this experiment might have been fatal to Ruth. We cannot easily account for this transaction, probably Naomi knew more than she revealed to her daughter-in-law. The experiment however was dangerous, and should in no sense be imitated. He will tell thee what thou shalt do - The Targum reads the clause thus: Thou shalt ask counsel from him, "and he shall tell thee what thou shouldest do."

Adam Clarke, 1831 · public domain