What did the Prophet Muhammad (saw) do after Dhul-Yadain asked him if the prayer had been reduced or forgotten?
 Narrated Abu Huraira.:                     Once Allah's Apostle offered two rak`at and finished his prayer. So Dhul-Yadain asked him, "Has the prayer been reduced or have you forgotten?" Allah's Apostle said, "Has Dhul-Yadain spoken the truth?" The people replied in the affirmative. Then Allah's Apostle stood up and offered the remaining two rak`at and performed Taslim, and then said Takbir and performed two prostrations like his usual prostrations, or a bit longer, and then got up.