It was narrated from Ibrahim bin Nashit that:
He asked Ibn Shihab about ghusl on Friday. He said: "It is a sunnah; Salim bin 'Abdullah told me, narrating from his father, that the Messenger of Allah (ﷺ) spoke about it from the minbar." (JA)
App reference (JA): Book 14, Hadith 43 (JA)
English reference (JA): Vol. 2, Book 14, Hadith 1407 (JA)
Arabic reference (JA): Book 14, Hadith 1417 (JA)