Exodus 16:4 Then the Lord said to Moses, “Behold, I am about to rain bread from heaven for you, and the people shall go out and gather a day's portion every day, that I may test them, whether they will walk in my law or not. 5 On the sixth day, when they prepare what they bring in, it will be twice as much as they gather daily.”
The giving of manna to the people of Israel is one of those "Bible Stories" many people have heard and move on. But not so fast. Why did God give it? Partially because they were hungry and complained that God only brought them out of Egypt to the wilderness to starve them there, but there is more to the story. He told Mose that it was a test of obedience and faith. They were to collect daily, but twice the amount on the sixth day. Why? He only provided what they needed daily so they would trust in Him as their Provider and that they would obey His law of the Sabbath: to rest and appreciate His provision, worship Him (which WAS the main reason for them leaving Egypt in the first place!), and be content in His plan for them. God doesn't want us to be worried with worry or resistant to His will. Which are you?