Easton's Bible Dictionary (1897)
Slope; side, a town in Benjamin, where Saul and his son Jonathan were buried (2 Sam. 21:14). It was probably Saul’s birthplace.
Smith's Bible Dictionary (1863)
(a rib), a city in the allotment of Benjamin, (Joshua 18:28) contained the family tomb of Kish, the father of Saul.
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
ZE'LAH (a rib), a city of Benjamin, Josh 18:28, the site of the family tomb of Kish, the father of Saul, 2 Sam 21:14, and probably Saul's birthplace. Conder suggests Kummua as its site. See also Zelzah.
Hitchcock's Bible Names (1869)
rib; side; halting