Buddha taught them the Four Noble Truths. The Noble Truth of: Suffering, Origin of Suffering, End of Suffering and The Way leading to the End of Suffering. During this first discourse, Kondanna understood everything and attained the first stage of enlightenment. Then he asked the Buddha to ordain him as a bhikkhu (Buddhist monk). Soon the other four also joined the Buddha's monastic order. All five monks practiced diligently and with the help of the Buddha they soon became fully enlightened Arahants.