David swore to Saul. Saul went home; but David and his men got them up to the stronghold.
but David and his men got them up unto the hold; in Engedi, 1 Samuel 23:29; not trusting to Saul, whose inconstancy, perfidy, cruel hatred, and malice, David full well knew; and therefore thought it not safe to return to his own house, nor to dwell in the open country, but in the wilderness, and among the rocks, and in the caves there, such as were in the wilderness of Engedi; and here, and at this time, he penned the fifty seventh psalm, see Psalms 57:1.