For the purpose of this blog, I'd like to examine who the bridesmaids are in the parable. For many years, I heard that the bridesmaids are the church at the time of the Rapture but it is interesting to note that the church is the Bride, not the Bridesmaid. Also the timing of the parable in the Olivet Discourse refers to the Second Coming, not the Rapture. "In fact, the Bride is never mentioned anywhere in the parable, and in any case could never be refused admittance to her own wedding banquet. She was obviously spirited away earlier while the bridesmaids slept. The bridesmaids represent people on Earth during the Great Tribulation after the church has gone." (source)
Each virgin was given a portion of oil (Holy Spirit) at the time they come to faith. This is evidenced that when the Bridegroom (Christ) returns they all light their lamps but some do not have enough oil (Holy Spirit). Salvation and the Holy Spirit can not be shared, I can not give you part of my salvation. The foolish go to "buy" their oil at the market but faithfulness can not be bought and they are shut out.
This parable serves as a warning for those who come to faith during the Tribulation but then afterwards in the Millennium.