The Sūtra of the Question of Subāhu
In this scripture Śākyamuni Buddha describes how a bodhisattva should ideally train in the six perfections. In the Veṇuvana near Rājagṛha, the Buddha teaches this sūtra in response to a single question put to him by the bodhisattva Subāhu: what are the qualities a bodhisattva should have in order to progress to perfect awakening? The Buddha responds by first listing the six perfections of generosity, ethical discipline, patience, diligence, concentration, and insight, and then expounding in greater detail on each perfection in turn.