They were a wall unto us both by night and day
Protecting and defending them against the Philistines, who, as they robbed the threshing floors of Keilah, would have plundered the flocks of Nabal; or it may be rather against the incursions of the Arabs in the wilderness of Paran, the posterity of Ishmael, who lived by plunder, and against the wild beasts of the desert, who otherwise would have carried off many of their sheep and lambs, by night or by day:
all the while we were with them keeping the sheep;
all which showed how reasonable it was that Nabal should have used them well, and given them a portion of his entertainment at his sheep shearing; for had it not been for them, he would not have had so many sheep to shear as he had.