The stone Ezel - It is not mentioned elsewhere, except possibly in 1 Samuel 20:41, where see the note.
Related Commentaries of 1 Samuel 20:19
1 Samuel 20:19
19 And when thou hast stayed three days, then thou shalt go down quickly,g and come to the place where thou didst hide thyself when the business was in hand, and shalt remain by the stone Ezel.