After leaving Elim, the Israelites entered the Wilderness of Sin on the fifteenth day of the second month after their departure from Egypt.
There the congregation complained against Moses and Aaron because of hunger and remembered the food they had eaten in Egypt. God responded by promising bread from heaven and providing quail in the evening and manna in the morning.
The instructions concerning gathering manna also introduced the people to a regular pattern in which twice as much was gathered on the sixth day and none was gathered on the Sabbath.
Numbers includes the Wilderness of Sin among the stations on Israel's journey toward Sinai.