Sunan an-Nasa'i
It was narrated from Abu Bujaid Al-Ansari from his grandmother that the Messenger of Allah (ﷺ) said: "Respond to the one who asks even with a sheep's foot." According to the narration of Harun: "With a sheep's burned foot."
أَخْبَرَنِي هَارُونُ بْنُ عَبْدِ اللَّهِ، قَالَ حَدَّثَنَا مَعْنٌ، قَالَ حَدَّثَنَا مَالِكٌ، ح وَأَنْبَأَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، عَنْ مَالِكٍ، عَنْ زَيْدِ بْنِ أَسْلَمَ، عَنِ ابْنِ بُجَيْدٍ الأَنْصَارِيِّ، عَنْ جَدَّتِهِ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " رُدُّوا السَّائِلَ وَلَوْ بِظِلْفٍ " . فِي حَدِيثِ هَارُونَ مُحْرَقٍ .
Grade: Sahih (Darussalam)
Reference