"Respond to the one who asks even with a sheep's foot." According to the narration of Harun: "With a sheep's burned foot."  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ رُدُّوا السَّائِلَ وَلَوْ بِظِلْفٍ فِي حَدِيثِ هَارُونَ مُحْرَقٍ