Read 1 Kings 17:8-16
8 Then the Lord said to Elijah, 9“Now go to the town of Zarephath, near Sidon, and stay there. I have commanded a widow who lives there to feed you.” 10So Elijah went to Zarephath, and as he came to the gate of the town, he saw a widow gathering firewood. “Please bring me a drink of water,” he said to her. 11And as she was going to get it, he called out, “And please bring me some bread, too.”
12 She answered, “By the living Lord your God I swear that I haven’t got any bread. All I have is a handful of flour in a bowl and a drop of olive oil in a jar. I came here to gather some firewood to take back home and prepare what little I have for my son and me. That will be our last meal, and then we will starve to death.”
13 “Don’t worry,” Elijah said to her. “Go ahead and prepare your meal. But first make a small loaf from what you have and bring it to me, and then prepare the rest for you and your son. 14For this is what the Lord, the God of Israel, says: ‘The bowl will not run out of flour or the jar run out of oil before the day that I, the Lord, send rain.’ ”
15 The widow went and did as Elijah had told her, and all of them had enough food for many days. 16As the Lord had promised through Elijah, the bowl did not run out of flour nor did the jar run out of oil.
In verses 1-7 we learn about Elijah living in the desert and being fed by ravens. I doubt he ate much - and when he appears to the widow in verse 10 he must have been a sight to see. She gives him something out of her nothing and her nothing never runs out.
Remind me when I think I have nothing that you are the source of my everything.