It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) advised three things, which I will never abandon whether on a journey or at home: (1) to perform the Witr prayer before sleeping, (2) to fast three days every month, (3) to offer two units of the Duha (forenoon) prayer. Later, Hasan began to mention "the Friday bath" in its place.