What is an example of the generosity shown by the Prophet Muhammad (saw) towards his wives?
 Narrated Aiman:                     I went to `Aisha and she was wearing a coarse dress costing five Dirhams. `Aisha said, "Look up and see my slave-girl who refuses to wear it in the house though during the lifetime of Allah's Apostle I had a similar dress which no woman desiring to appear elegant (before her husband) failed to borrow from me."