So she kept fast by the maidens of Boaz to glean,.... Accepting the kindness of Boaz, and attending to the advice of her mother-in-law, as well as using all diligence to get a livelihood for her mother and herself; in which she was a wonderful instance of dutiful affection, humility, and industry: and so she continuedunto the end of barley harvest, and of wheat harvest; which latter began at Pentecost, as the former did at the passover; and, according to the Midrash , from the beginning of the one, to the end of the other, were three months; though it may be, they were gathered in sooner: indeed from the passover to Pentecost were seven weeks, which was the difference between the beginning of one harvest, and the beginning of the other:and dwelt with her mother in law; which is to be understood either of her coming home at night, after she had been gleaning all day, and lodging with her mother-in-law, which was her constant custom during both harvests; or that after the harvests were ended, she continued to dwell with her mother-in-law; which seems to be added for the sake of carrying on the history in the following chapter.
Midrash Ruth, fol. 33. so Alshech in loc.