What did the Qaif say when he saw the feet of Zaid and Usama, that made the Prophet Muhammad (saw) so joyful?
 Narrated `Aisha:                     That Allah's Apostle came to her in a happy mood with his features glittering with joy, and said, "Have you not heard what the Qaif has said about Zaid and Us-ama? He saw their feet and remarked. These belong to each other." (i.e. They are father and son.)