A Commentary, Critical, Practical, and Explanatory on the Old and New Testaments, by Robert Jamieson, A.R. Fausset and David Brown  at sacred-texts.com
rut 2:2RUTH GLEANS IN THE FIELD OF BOAZ. (Rut 2:1-3)
Ruth . . . said unto Naomi, Let me now go to the field, and glean--The right of gleaning was conferred by a positive law on the widow, the poor, and the stranger (see on Lev 19:9 and Deu 24:19). But liberty to glean behind the reapers [Rut 2:3] was not a right that could be claimed; it was a privilege granted or refused according to the good will or favor of the owner.
rut 2:3her hap was to light on a part of the field belonging unto Boaz--Fields in Palestine being unenclosed, the phrase signifies that portion of the open ground which lay within the landmarks of Boaz.
rut 2:4HE TAKES KNOWLEDGE OF HER, AND SHOWS HER FAVOR. (Rth. 2:4-23)
Boaz came from Beth-lehem, and said unto the reapers, The Lord be with you--This pious salutation between the master and his laborers strongly indicates the state of religious feeling among the rural population of Israel at that time, as well as the artless, happy, and unsuspecting simplicity which characterized the manners of the people. The same patriarchal style of speaking is still preserved in the East.
rut 2:5his servant that was set over the reapers--an overseer whose special duty was to superintend the operations in the field, to supply provision to the reapers, and pay them for their labor in the evening.
rut 2:7she said . . . Let me glean and gather after the reapers among the sheaves--Various modes of reaping are practised in the East. Where the crop is thin and short, it is plucked up by the roots. Sometimes it is cut with the sickle. Whether reaped in the one way or the other, the grain is cast into sheaves loosely thrown together, to be subjected to the process of threshing, which takes place, for the most part, immediately after the reaping. Field labors were begun early in the morning--before the day became oppressively hot.
she tarried a little in the house--that is, the field tent, erected for the occasional rest and refreshment of the laborers.
rut 2:8said Boaz unto Ruth, . . . bide here fast by my maidens--The reaping was performed by women while the assortment of sheaves was the duty of men-servants. The same division of harvest labor obtains in Syria still. Boaz not only granted to Ruth the full privilege of gleaning after his reapers, but provided for her personal comfort.
rut 2:9go unto the vessels, and drink of that which the young men have drawn--Gleaners were sometimes allowed, by kind and charitable masters, to partake of the refreshments provided for the reapers. The vessels alluded to were skin bottles, filled with water--and the bread was soaked in vinegar (Rut 2:14); a kind of poor, weak wine, sometimes mingled with a little olive oil--very cooling, as would be required in harvest-time. This grateful refection is still used in the harvest-field.
rut 2:14he reached her parched corn, and she did eat, and was sufficed, and left--some of the new grain, roasted on the spot, and fit for use after being rubbed in the hands--a favorite viand in the East. He gave her so much, that after satisfying her own wants, she had some (Rut 2:18) in reserve for her mother-in-law.
rut 2:16let fall also some of the handfuls of purpose for her--The gleaners in the East glean with much success; for a great quantity of corn is scattered in the reaping, as well as in their manner of carrying it. One may judge, then, of the large quantity which Ruth would gather in consequence of the liberal orders given to the servants. These extraordinary marks of favor were not only given from a kindly disposition, but from regard to her good character and devoted attachment to her venerable relative.
rut 2:17and beat out that she had gleaned--When the quantity of grain was small, it was beat out by means of a stick.
an ephah--supposed to contain about a bushel.
rut 2:20the man is . . . one of our next kinsmen--Hebrew, "one of our redeemers," on whom it devolves to protect us, to purchase our lands, and marry you, the widow of his next kinsman. She said, "one of them," not that there were many in the same close relationship, but that he was a very near kinsman, one other individual only having the precedence.
rut 2:21all my harvest--both barley and wheat harvests. The latter was at the end of May or the beginning of June.
rut 2:22Naomi said unto Ruth . . . It is good . . . that thou go out with his maidens--a prudent recommendation to Ruth to accept the generous invitation of Boaz, lest, if she were seen straying into other fields, she might not only run the risk of rude treatment, but displease him by seeming indifferent to his kind liberality. Moreover, the observant mind of the old matron had already discerned, in all Boaz' attentions to Ruth, the germs of a stronger affection, which she wished to increase.