“And when the dew had gone up, there was on the face of the wilderness a fine, flake-like thing, fine as frost on the ground. When the people of Israel saw it, they said to one another, ‘What is it?’ For they did not know what it was. And Moses said to them, ‘It is the bread that the Lord has given you to eat.'” (Exodus 16:14-15,ESV)
After the Lord had delivered them from the Egyptians by the mighty miracle of the parting of the Red Sea, the tribes of Israel journeyed on into the wilderness. They began to murmur and complain. They were not starving but they did have a need for sustenance. Of course there is a proper and more respectful way to ask for help from the Lord but the Israelites did not approach God in this way. They complained and spoke out against the faithfulness of the Lord and the authority of Moses. They looked fondly back to their slavery days and the fine food they supposedly had then. They forgot the bitterness and pain of the old life.
The Lord graciously responded to their requests even though they were in the form of complaints. He gave them meat to eat, quail, an unexpected blessing. He also gave them total sustenance, however, in the form of manna. They would eat this manna for the next 40 years and it would meet their every need.
The Lord promises us to supply our every need for life. No thing or person in this life will provide such sustenance for God grants us grace in the person of Jesus. He alone is the Bread of Life. We need not complain to receive His grace and provision, as the Israelites did, but only ask humbly and contritely and He will give us all that we need.