The widow of a man of the sons of the prophet asked the prophet Elisha for aid in order to prevent her sons from being taken into slavery due to debt.
Your servant my husband is dead, and you know that your servant [reverently] feared the Lord; but the creditor is coming to take my two sons to be his slaves [in payment for a loan].— 2 Kings 4:1 (AMP)
Elisha then asked if she had anything in her house, and the widow said that she only had a jar of oil:
Your maidservant has nothing in the house except a [small] jar of [olive] oil (2 Kings 4:2 (AMP)).
Elisha told her to gather empty containers from her neighbors and bring the containers into her house. She was to then shut the door behind her, leaving only herself and her sons in the house. Inside, she was to fill each container with the oil.
Go, borrow containers from all your neighbors, empty containers—and not just a few Then you shall go in and shut the door behind you and your sons, and pour out [the oil you have] into all these containers, and you shall set aside each one when it is full.— 2 Kings 4:3–4:4 (AMP)
She poured and poured, and miraculously, the oil kept coming forth. Finally, one of her son informed her that there were any more containers left, and only then did the oil cease.
The widow informed Elisha, and Elisha commanded her to sell the oil, save her sons from slavery, and to live off of whatever remains:
Go, sell the oil and pay your debt, and you and your sons can live on the rest (2 Kings 4:7 (AMP)).