(Mv.II.14.1) [166] Then the thought occurred to the monks, “How many Uposathas are there?”

They reported the matter to the Blessed One.

“Monks, there are these two Uposathas: on the fourteenth and on the fifteenth. These are the two Uposathas.”

(Mv.II.14.2) Then the thought occurred to the monks, “How many Uposatha transactions are there?”

They reported the matter to the Blessed One.

“Monks, there are these four Uposatha transactions: a factional Uposatha transaction not in accordance with the Dhamma, a united Uposatha transaction not in accordance with the Dhamma, a factional Uposatha transaction in accordance with the Dhamma, a united Uposatha transaction in accordance with the Dhamma.

(Mv.II.14.3) “With regard to that, monks — the factional Uposatha transaction not in accordance with the Dhamma — this sort of Uposatha transaction should not be done and has not been allowed by me.

“With regard to that, monks — the united Uposatha transaction not in accordance with the Dhamma — this sort of Uposatha transaction should not be done and has not been allowed by me.

“With regard to that, monks — the factional Uposatha transaction in accordance with the Dhamma — this sort of Uposatha transaction should not be done and has not been allowed by me.

“With regard to that, monks — the united Uposatha transaction in accordance with the Dhamma — this sort of Uposatha transaction may be done and has been allowed by me.

“Therefore, monks, ‘We will do this sort of Uposatha transaction: united and in accordance with the Dhamma’”: That’s how you should train yourselves.”