7 The number of the days that David lived in the country of the Philistines was a full year and four months.
*Minor differences ignored. Grouped by changes, with first version listed as example.
And the time that David dwelt in the country of the Philistines,.... At Gath and Ziklag:
was a full year and four months; or "days and four months"; days being sometimes put for a year, Judges 17:10; though some interpret it not of a year, but of some few days out of the fifth month, besides the four months; so Jarchi and Kimchi; and Josephus (h) makes his abode to be four months and twenty days; but, according to the Septuagint and Vulgate Latin versions, it was only four months; and so it may be rendered, "days, that is, four months"; for according to the Jewish chronology (i) Samuel died four months before Saul, and this flight of David was after the death of Samuel, and when Saul died he left the land of the Philistines, and took the throne of Judah; See Gill on 1-Samuel 25:1.
(h) Antiqu. l. 6. c. 13. sect. 10. (i) Sepher Olam Rabba c. 13. p. 37.
The statement that David remained a year and four months in the land of the Philistines, is a proof of the historical character of the whole narrative. The ימים before the "four months" signifies a year; strictly speaking, a term of days which amounted to a full year (as in Leviticus 25:29 : see also 1-Samuel 1:3, 1-Samuel 1:20; 1-Samuel 2:19).
*More commentary available at chapter level.