1 Samuel 25:14-17

14But one of the young men told Abigail, Nabal’s wife, saying, Behold, David sent messengers out of the wilderness to salute our master; and he flew upon them.

15But the men were very good unto us, and we were not hurt, neither missed we any thing, as long as we were conversant with them, when we were in the fields:

16they were a wall unto us both by night and by day, all the while we were with them keeping the sheep.

17Now therefore know and consider what thou wilt do; for evil is determined against our master, and against all his house: for he is such a son of Belial, that one cannot speak to him.