The number of Buddha's followers gradually increased. Nobles, Brahmins and many wealthy men became his disciples. Buddha paid no attention to caste. The poor and the outcastes were admitted to his order. Those who wanted to become full members of his order were obliged to become monks and to observe strict rules of conduct. Buddha had many lay disciples also. Those lay members had to provide for the wants of the monks.
In the forest of Uruvila, there were three brothers - all very famous monks and philosophers. They had many learned disciples. They were honoured by kings and potentates. Lord Buddha went to Uruvila and lived with those three monks. He converted those three reputed monks, which caused a great sensation all over the country.