When the nation of Israel was in the desert, God provided food for them each day. The Israelites called it manna and it miraculously appeared every morning. The manna would provide them with the sustenance they needed for that day. If they tried to gather extra and stockpile it, it would turn bad (except for the Sabbath). God gave them what they needed for that day but no more; it was essentially their daily bread.
Later on, Jesus instructed his disciples to pray for God to give them their “daily bread.” The disciples surely connected that with Moses and the manna in the desert, and as a result they were assured God would faithfully provide for them each day.
This is just one of many amazing ways the Old and New Testaments of the Bible are connected.
Manna is the daily bread that God faithfully provides.