Exodus 15:22-17:7

Then the whole community of Israel set out from Elim and journeyed into the wilderness of Sin, between Elim and Mount Sinai. They arrived there on the fifteenth day of the second month, one month after leaving the land of Egypt. There, too, the whole community of Israel complained about Moses and Aaron. 16:1-2
It happened again. As the Israelites encountered danger, shortages, and inconvenience, they complained bitterly and longed to be back in Egypt. But as always, God provided fr their needs. Difficult circumstances often lead to stress, and complaining is a natural response. The Israelites didn't really want to be back Egypt; they just wanted life to get a little easier. In the pressure of the moment, they could not focus on the cause of their stress (in this case the lack of trust in God); they could only think about the quickest way, resist the temptation to make a quick escape. Instead, focus on God's power and wisdom to help you deal with the cause of your stress.

Taken from the NLT Life Application Study Bible