Sunan an-Nasai Book 45, Hadith 4815

أَخْبَرَنَا أَحْمَدُ بْنُ سُلَيْمَانَ، قَالَ حَدَّثَنَا يَزِيدُ، قَالَ أَنْبَأَنَا كَهْمَسٌ، عَنْ عَبْدِ اللَّهِ بْنِ بُرَيْدَةَ، عَنْ عَبْدِ اللَّهِ بْنِ مُغَفَّلٍ، أَنَّهُ رَأَى رَجُلاً يَخْذِفُ فَقَالَ لاَ تَخْذِفْ فَإِنَّ نَبِيَّ اللَّهِ صلى الله عليه وسلم كَانَ يَنْهَى عَنِ الْخَذْفِ أَوْ يَكْرَهُ الْخَذْفَ ‏.‏ شَكَّ كَهْمَسُ ‏.‏

It was narrated from 'Abdullah bin Mughaffal that he saw a man throwing pebbles and he said:"Do not throw pebbles, for the Prophet of Allah forbade throwing pebbles," or "he disliked the throwing of pebbles." Kahmas (one of the narrators) was not sure