The fatlings - The present Hebrew text cannot be so rendered. It can only mean “the second best” (compare the margin), i. e., sheep of the age to cut or shed the two teeth, sheep in their prime. But it is probable that the reading is corrupt, and that “fat or dainty bits” is the true reading.
Related Commentaries of 1 Samuel 15:9
1 Samuel 15:9
9 But Saul and the people spared Agag, and the best of the sheep, and of the oxen, and of the fatlings,a and the lambs, and all that was good, and would not utterly destroy them: but every thing that was vile and refuse, that they destroyed utterly.