In the fifth aliyah, the Jews run out of the matzo they brought with them from Egypt. They murmur that at least in Egypt they had plenty of bread to eat, and here it appears to them that they will die of hunger.
G-d answers that He will provide quail and manna for them to eat, and that each day they should gather only what they need for one day, but on Friday they will have enough for two days (to provide for Shabbos)
