Adapted from the Translation by T. W. Rhys Davids and Hermann Oldenberg
SECOND KHANDHAKA (THE UPOSATHA CEREMONY, AND THE PATIMOKKHA)
Chapter-10 : Theras(Elders) Should Assemble First For Patimokkha(Confession) Ceremony.
At that time in a certain district on the day of Uposatha the young Bhikkhus, who had assembled first, thought: 'The Theras(Elder Monks) do not come yet,' and went away. The Uposatha service was held after the right time.
They told this thing to the Lord Buddha.
'I prescribe, O Bhikkhus(Monks), that on the Uposatha day the Theras ought to assemble first.'