Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh))
Bukhari :: Book 6 :: Volume 60 :: Hadith 365
Narrated 'Uqba bin Sahban:
'Abdullah bin Mughaffal Al-Muzani who was one of those who witnessed (the event of) the tree, said, "The Prophet forbade the throwing of small stones (with two fingers)." 'Abdullah bin Al-Mughaffal Al-Muzani also said, "The Prophet also forbade urinating at the place where one takes a bath."