478 — Abu Bakr ibn Abi Shaybah narrated to us, Sufyan ibn ‘Uyaynah narrated to us, from ‘Asim, from Zirr, from Safwan ibn ‘Assal, who said: The Prophet, peace and blessings be upon him, used to command us not to remove our leather socks for three days except in the case of major ritual impurity (janabah), but [we could keep them on] in the case of excrement, urine, and sleep. (1)

63 — Chapter: On performing ablution (wudu) from touching the penis

479 — Muhammad ibn ‘Abdullah ibn Numayr narrated to us, ‘Abdullah ibn Idris narrated to us, from Hisham ibn ‘Urwah, from his father, from Marwan ibn al-Hakam, from Busrah bint Safwan, who said: The Messenger of Allah, peace and blessings be upon him, said: "If any one of you touches his penis, let him perform ablution." (2)

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= Also recorded by Abu Dawud (203) via the chain of Baqiyyah ibn al-Walid, with this isnad.
See the remainder of its takhrij and discussion in "Al-Musnad" (887).
On this topic, there is also a hadith from Mu‘awiyah in Ahmad (16879), whose chain is weak, and it is also narrated as a mawquf (stopped at a Companion).
His saying: "al-sah" refers to the ring of the anus.
And "al-wika'" is the cord with which a waterskin, pouch, or similar is tied.

(1) Its chain is hasan (good) due to ‘Asim — who is Ibn Abi al-Najud — and Zirr is Ibn Hubaysh.
Also recorded by al-Tirmidhi (96) and (3845), and al-Nasa’i 1/83 and 83–84 and 98 via the chain of ‘Asim, with this isnad.
It is in "Musnad Ahmad" (18091) and "Sahih Ibn Hibban" (1100).

(2) Its chain is sahih (authentic).
Also recorded by Abu Dawud (181), and al-Nasa’i 1/100 and 100–101 via the chain of ‘Abdullah ibn Abi Bakr ibn Muhammad ibn ‘Amr ibn Hazm, and al-Nasa’i 1/216 via the chain of Ibn Shihab al-Zuhri, both from ‘Urwah ibn al-Zubayr, from Marwan ibn al-Hakam, from Busrah bint Safwan. =