2 Chronicles 36:21 - Joseph Benson’s Commentary on the Old and New Testaments

Until the land had enjoyed her sabbaths “God had commanded them to let their land rest every seventh year; and because the Jews had violated this, as well as other precepts, God gave their land a long sabbath, or rest, for no less than ten times seven years, which Jeremiah threatened, as in the margin. If it be true, that they had neglected this law for the space of four hundred and ninety years, having ploughed their ground in the seventh as well as in other years, then the judgment of God upon them was very remarkable, in causing their ground to rest, and be free from tillage, just as long as it should have been if they had observed his law. For in those four hundred and ninety years, says Procopius Gazæus, when they were under the government of kings, there were seventy years to be kept as sabbaths, which, that the land might enjoy its sabbath, were spent in the captivity of Babylon. Their punishment, too, was made more remarkable in this particular, if it be true, as some have observed, that both the kingdom of Samaria and the kingdom of Judah were destroyed in a sabbatical year; and that immediately after a jubilee, the city and temple were destroyed by Titus, according to Scaliger's computation.” See Patrick, Calmet, and Dodd.