Ammar bin Abi Ammar, the freed slave of Banu Hashim, narrates: Once he passed by Sayyiduna Abd al-Rahman bin Samurah (may Allah be pleased with him), who was at "the canal of Umm Abdullah", pouring water over his boys and his slaves. Ammar said to him: "O Abu Sa'id! Today is Jumu'ah." Sayyiduna Abd al-Rahman bin Samurah (may Allah be pleased with him) replied to him: The Prophet (peace and blessings be upon him) said: "When heavy rain is falling, a man should pray at his dwelling."
Abdullah recorded it from his father (Imam Ahmad) by way of wijadah (a found written record); its chain contains a narrator, Nasih bin al-Ala', whom Yahya bin Ma'in, and Imam Bukhari (may Allah have mercy on him) according to one report, declared da'if (weak). He mentioned this hadith in connection with him and stated that no hadith other than this one is narrated through him. This person is thiqah (trustworthy); Imam Abu Dawud declared him thiqah (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 3184