Hadith.1135 - Umar ibn Yazid asked Imam Jafar ibn Muhammad Al-Sadiq (as) about the narration that states it is not appropriate to perform supererogatory (nafl) prayers at the time of every obligatory (fardh) prayer. He asked: "What is the limit for this time?" He (as) replied: "When the person giving the iqamah (call immediately preceding the prayer) begins the iqamah." Umar said: "People differ in the timing of the iqamah." He (as) responded: "The one giving the iqamah is the one with whom the prayer is being established”.