Ruth 3:4

When he lieth down, to rest or sleep, as upon such occasions they used to do in those hot countries. Thou shalt go in: though Naomi and Ruth seem to be virtuous and modest women, and their intent was lawful and honest; yet there seems to be a manifold irregularity in the manner of it. First, It seems to be against that modesty which should be eminent in that sex, and in unmarried persons. Secondly, Against honesty, both because it was an injury to another person, who was nearer akin, whose right this was; which Naomi could not be ignorant of; and because it was a preposterous and precipitant method, not agreeable either to the rules of Scripture, or the usage of well-mannered nations, or that decency which even nature requires. Thirdly, Against prudence; for it might have proved the occasion, as of many sins, so of great shame to all of them; and a means to alienate his affection from her, which she sought to engage. And though there be some circumstances which alleviate the fact, as the experience which Naomi had of the wisdom and sobriety both of Boaz and of Ruth, yet she knew not what the event would be; and that there was something of shamefulness in the thing, may be gathered both from Naomi's choice of the night for it, as if it were a work of darkness, and from Boaz's fear lest this should be known, Ruth 3:14. And it is an aggravation of it, that this course was unnecessary, and she had a plain and likely way, which was directly to address herself to Boaz, or the next kinsman, and to require the duty which by God's law he was bound to perform, and this before witnesses, as Boaz did. And her clandestine proceeding seems to have arisen from a distrust of God's providence to bring about what she desired in the ordinary way. Uncover his feet; remove the clothes which were upon his feet; thereby to awaken him. What thou shalt do; how thou shouldst carry thyself, or what course thou shalt take to obtain that marriage which belongs unto thee. Only there were some rites to be observed, and circumstances to be done, before they came to the conclusion of the marriage, about which Boaz would instruct her.