Sahih al-Bukhari 4841
Sahih al-Bukhari · Book 65: Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh)) · The Statement of Allah the Most High: "...When they gave their Bai'a (pledge) to you (O Muḥammad pbuh) under the tree..." (V.48:18)
Narrated `Uqba bin Sahban:
حَدَّثَنَا عَلِيُّ بْنُ عَبْدِ اللَّهِ ، حَدَّثَنَا شَبَابَةُ ، حَدَّثَنَا شُعْبَةُ ، عَنْ قَتَادَةَ ، قَالَ سَمِعْتُ عُقْبَةَ بْنَ صُهْبَانَ ، عَنْ عَبْدِ اللَّهِ بْنِ مُغَفَّلٍ الْمُزَنِيِّ ، إِنِّي مِمَّنْ شَهِدَ الشَّجَرَةَ، نَهَى النَّبِيُّ صلى الله عليه وسلم عَنِ الْخَذْفِ .
`Abdullah bin Mughaffal Al-Muzani who was one of those who witnessed (the event of) the tree, said, "The Prophet (ﷺ) forbade the throwing of small stones (with two fingers)."