What did the Prophet Muhammad (saw) instruct Muslims to do on Fridays?
 Narrated Ibn `Umar:                     While `Umar bin Al-Khattab was standing and delivering the sermon on a Friday, one of the companions of the Prophet, who was one of the foremost Muhajirs (emigrants) came. `Umar said to him, "What is the time now?" He replied, "I was busy and could not go back to my house till I heard the Adhan. I did not perform more than the ablution." Thereupon `Umar said to him, "Did you perform only the ablution although you know that Allah's Apostle (p.b.u.h) used to order us to take a bath (on Fridays)?"