"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.
لاَ تَخْذِفْ فَإِنَّ نَبِيَّ اللَّهِ ﷺ كَانَ يَنْهَى عَنِ الْخَذْفِ أَوْ يَكْرَهُ الْخَذْفَ شَكَّ كَهْمَسُ