What is the oil used for in the Parable of the wise and foolish virgins?

The oil was used for lamps the foolish virgins did not have extra oil and kept their lamps going when they should have turned them off.

Source:

Matthew 25:1-13

Elisha helped a widow who’s sons were about to be enslaved to pay debts. What did Elisha do to pay her debts?

God caused a single jar of oil to fill all the containers she could find. When sold this paid here debts and left a nest egg to live on.

Source:

2^nd Kings 4:1-7

What did God do for the widow of Zarephath who fed Elijah?

God refilled the oil in her curse (jug) for as long as there was a drought. She and her neighbors had food due to her faith.

Source:

1^st Kings 17:10-16