Smith's Bible Dictionary
Tob. (good). The land of Tob. A place in which Jephthah took refuge, when expelled from home, by his half-brother, Judges 11:3, and where he remained, at the head of a band of freebooters, till he was brought back, by the sheikhs of Gilead. Judges 11:5.
The narrative implies that the land of Tob, was not far distant from Gilead; at the same time, from the nature of the case, it must have lain out toward the eastern deserts. It is undoubtedly mentioned again in 2 Samuel 10:6; 2 Samuel 10:8, as Ishtob, that is, man of Tob, meaning, according to a common Hebrew idiom, the men of Tob. After a long interval, it appears again, in the Maccabaean history, 1 Maccabees 5:13, in the names of Tobie and Tubieni. 2 Maccabees 12:17. No identification of the ancient, district with any modern one has yet been attempted.
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Smith, William, Dr. Entry for 'Tob'. Smith's Bible Dictionary. https://www.studylight.org/dictionaries/eng/sbd/t/tob.html. 1901.