Matthew 25:3 - Ellicott's Commentary On The Whole Bible

Took no oil with them. — In the interpretation of the parable, the lamp or torch is obviously the outward life of holiness by which the disciple of Christ lets his light shine before men (Matthew 5:16), and the “oil” is the divine grace, or more definitely, the gift of the Holy Spirit, without which the torch first burns dimly and then expires. The foolish virgins neglected to seek that supply, either from the Great Giver, or through the human agencies by which He graciously imparts it.