What was the command of the Prophet Muhammad (saw) regarding combining two types of prayers  without talking or going out?
 'Umar b. 'Ata' b. Abu Khuwar said that Nafi' b. Jubair sent him to al- Sa'ib the son of Namir's sister with a view to asking him about what he had seen in the prayer of Mu'awiya. He said:                      Yes, I observed the Jumu'a prayer along with him in Maqsura and when the Imam pronounced salutation I stood up at my place and observed (Sunan rak'ahs). As he entered (the apartment) he sent for me and said: Do not repeat what you have done. Whenever you have observed the Jumu'a prayer, do not observe (Sunan prayer) till you, have talked or got out For the Messenger of Allah (may peace be upon him) had ordered us to do this and not to combine two (types of) prayers without talking of going out.