Prophesying was among the miraculous gifts of the holy spirit, and these young women used that gift in fulfillment of Joel 2: 28, 29.
كَانَ لَدَى فِيلِبُّسَ ٱلْمُبَشِّرِ أَرْبَعُ بَنَاتٍ عَذَارَى غَيُورَاتٍ مِثْلَهُ فِي عَمَلِ ٱلْبِشَارَةِ .‏