What were the Prophet Muhammad (saw)'s actions after Dhul-Yaddain asked him whether his prayer had been reduced or forgotten?
 Narrated Abu Huraira:                     Allah's Apostle finished his prayer after offerings two rak`at only. Dhul-Yaddain asked him whether the prayer had been reduced, or you had forgotten?" The Prophet said, "Is Dhul-Yaddain speaking the truth?" The people said, "Yes." Then Allah's Apostle stood up and performed another two rak`at and then finished prayer with Taslim, and then said the Takbir and performed a prostration similar to or longer than his ordinary prostrations; then he raised his head, said Takbir and prostrated and then raised his head (Sahu prostrations).