51 - Chapter: Wudu (Ablution) Once

138 - Musaddad narrated to us, Yahya narrated to us, from Sufyan, Zayd ibn Aslam narrated to me, from 'Ata' ibn Yasar, from Ibn 'Abbas, who said: "Shall I not inform you of the wudu of the Messenger of Allah, peace and blessings be upon him?" Then he performed wudu once, once.

52 - Chapter: On the Distinction Between Rinsing the Mouth and Sniffing Water into the Nose

139 - Humayd ibn Mas'adah narrated to us, Mu'tamir narrated to us, he said: I heard Layth mentioning from Talhah, from his father, from his grandfather, who said: I entered — meaning — upon the Prophet, peace and blessings be upon him, while he was performing wudu, and water was flowing from his face and his beard onto his chest. I saw him separating between rinsing the mouth and sniffing water into the nose.

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Al-Bukhari also recorded it (140) via the chain of Sulayman ibn Bilal, al-Tirmidhi (36), al-Nasa'i in "al-Kubra" (106), and Ibn Majah (439) via the chain of Muhammad ibn 'Ajlan, al-Nasa'i in "al-Mujtaba" (101), and Ibn Majah (403) via the chain of 'Abd al-'Aziz ibn Muhammad al-Darawardi — all three of them from Zayd ibn Aslam, with this chain. Ibn 'Ajlan's narration in al-Tirmidhi and Ibn Majah is abbreviated to wiping the head and ears, and al-Darawardi's narration in Ibn Majah is abbreviated to rinsing the mouth and sniffing water into the nose. Whoever narrated it in full and mentioned washing the feet did not mention the sandals.
It is also in "Musnad Ahmad" (2416), and "Sahih Ibn Hibban" (1078) and (1086).

(1) Its chain is authentic. Yahya: he is Ibn Sa'id al-Qattan, and Sufyan: he is Ibn Sa'id al-Thawri.
Al-Bukhari also recorded it (157), al-Tirmidhi (42), al-Nasa'i in "al-Kubra" (85), and Ibn Majah (411) via the chain of Sufyan al-Thawri, with this chain.
It is also in "Musnad Ahmad" (2072), and "Sahih Ibn Hibban" (1095).

(2) Its chain is weak; Layth — he is Ibn Abi Sulaym — is weak, and Musarrif, the father of Talhah, is unknown. Mu'tamir: he is Ibn Sulayman.