And now is not Boaz of our kindred, with whose maidens thou wast? Behold, he winnoweth barley to night in the threshingfloor.

Wesley's Notes

3:2 Threshing - floor - Which was in a place covered at the top, but open elsewhere, whither Ruth might easily come. And this work of winnowing corn was usually ended with a feast.

Jamieson-Fausset-Brown Bible Commentary

2. he winnoweth barley to-night in the threshing-floor-The winnowing process is performed by throwing up the grain, after being trodden down, against the wind with a shovel. The threshing-floor, which was commonly on the harvest-field, was carefully leveled with a large cylindric roller and consolidated with chalk, that weeds might not spring up, and that it might not chop with drought. The farmer usually remained all night in harvest-time on the threshing-floor, not only for the protection of his valuable grain, but for the winnowing. That operation was performed in the evening to catch the breezes which blow after the close of a hot day, and which continue for the most part of the night. This duty at so important a season the master undertakes himself; and, accordingly, in the simplicity of ancient manners, Boaz, a person of considerable wealth and high rank, laid himself down to sleep on the barn floor, at the end of the heap of barley he had been winnowing.

Matthew Henry's Concise Commentary

3:1-5 The married state should be a rest, as much as any thing upon earth can be so, as it ought to fix the affections and form a connexion for life. Therefore it should be engaged in with great seriousness, with earnest prayers for direction, for the blessing of God, and with regard to his precepts. Parents should carefully advise their children in this important concern, that it may be well with them as to their souls. Be it always remembered, That is best for us which is best for our souls. The course Naomi advised appears strange to us; but it was according to the laws and usages of Israel. If the proposed measure had borne the appearance of evil, Naomi would not have advised it. Law and custom gave Ruth, who was now proselyted to the true religion, a legal claim upon Boaz. It was customary for widows to assert this claim, De 25:5-10. But this is not recorded for imitation in other times, and is not to be judged by modern rules. And if there had been any evil in it, Ruth was a woman of too much virtue and too much sense to have listened to it.