"I saw the Prophet carrying Hasan bin 'Ali on his shoulder, and his saliva was dripping down on him."
Sunan Ibn Majah Book 1, Hadith 392
← Previous Hadith "I broke one of my forearms and I asked the Prophet about that. He told me to wipe over the bandages." (Maudu')

Another chain with similar meaning.

Sunan Ibn Majah Book 1, Hadith 391 Next Hadith → "A bucket was brought to the Prophet; he rinsed his mouth and spat into it, and it was like musk or better than musk, and he rinsed his nostrils outside the bucket."

Sunan Ibn Majah Book 1, Hadith 393