Israelites arrived at the Sin Desert a month after they left Egypt.
Since there were not enough to eat and drink,
people began to speak against Moses.
Israelites longed for the days back in Egypt
where they were able to eat full.
and their complaints had reached God.
Then God told Moses
"I am going to rain down food from heaven,
and bring quails so they can have meats too."
That evening God brought great numbers of quail over the camp.
The next morning the desert all around the camp was covered with Manna.
(think flakes and white like frost)
So the Israelites went out and gathered this food from heaven.