Elijah

 and he called to her, and said, Fetch me, I pray thee, a little water in a vessel, that I may drink.
11 And as she was going to fetch it, he called to her, and said, Bring me, I pray thee, a morsel of bread in thine hand.
12 And she said, As the LORD thy God liveth, I have not a cake, but an handful of meal in a barrel, and a little oil in a cruse: and, behold, I am gathering two sticks, that I may go in and dress it for me and my son, that we may eat it, and die.

Elijah meets with a widow in a neighboring country, and, through her obedience to Elijah’s request, God provides food enough for Elijah, the woman, and her son. Miraculously, the widow’s barrel of flour and jar of oil never run out (1 Kings 17:8–16). The lesson for the believer is that, if we walk in fellowship with the Lord and obey Him, we will be open to His will. And when we are in God’s will, He fulfills all of our needs, and His mercy to us never runs short.

indicates the importance of Jesus' teaching to the disciples. 

Jesus affirms the widow's giving not because it is generous, but because she does not give out of her abundance, rather out of her poverty she gives all she has to live on.