It was narrated from 'Abdul Jabbar bin Wa'il that his father said:
"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." (DE)
English reference (DE): Vol. 1, Book 1, Hadith 659 (DE)
Arabic reference (DE): Book 1, Hadith 704 (DE)