He rinsed his mouth and sniffed water into his nose from a single handful, doing that three times. Then he mentioned something similar.
حدثنا مسدد حدثنا خالد عن عمرو بن يحيى المازني عن أبيه
فمضمض واستنشق من كف واحدة يفعل ذلك ثلاثا ثم ذكر نحوه
Bukhari narrated it in the Book of Wudu, chapter "One who rinses the mouth and sniffs water into the nose from a single scoop," Hadith 191, from Musaddad, and Muslim narrated it, Hadith 235, from the report of Khalid bin Abdullah, with the same wording. See the previous hadith.