Adam Clarke on Job 5:19

He shall deliver thee in six troubles - The numbers six and seven are put here for many. Though a number of troubles should come upon thee all at once, and there should be no hope, humanly speaking, yet God would rid thee out of them all; for he saves as well from many as from few. We may also understand the words, He who hath been thy deliverer in past troubles, will not deny his help in those which are to come.