The Messenger of Allah (may Allah's peace and blessings be upon him) spat on the leg of ‘Amr ibn Mu‘ādh when his leg was cut off, so he was healed
Authentic hadithعن بريدة رضي الله عنه قال: «إنَّ رسولَ الله صلى الله عليه وسلم تَفَلَ في رِجْل عمرو بن مُعاذ حِين قُطِعتْ رِجْلُه، فبَرأَ».
Buraydah reported: The Messenger of Allah (may Allah's peace and blessings be upon him) spat on the leg of ‘Amr ibn Mu‘ādh when his leg was cut off, so he was healed.
Explanation
When the leg of ‘Amr ibn Mu‘ādh,(may Allah be pleased with him) was cut off, the Prophet (may Allah's peace and blessings be upon him) spat his pure saliva on it, so ‘Amr was recovered and healed by Allah's permission. This was an evident miracle of the Prophet (may Allah's peace and blessings be upon him).
Source · Narrated by Ibn Hebban
From the Hadith Encyclopedia (hadeethenc.com).