Musnad Abu Ya'la al-Mawsili 111:60

Ubayd Allah ibn Umar narrated to us, Abd al-Aziz ibn Muhammad narrated to us, from Zayd ibn Aslam, who said: Ata narrated to me, from Ibn Abbas, that the Messenger of Allah (may Allah bless him and grant him peace) performed ablution, so he rinsed his mouth and snuffed water into his nose from a single handful.