The Messenger of Allah ﷺ said, "Most of the punishment of the grave is due to urine, so be careful to avoid it."
قال رسول الله ﷺ: إن عامة عذاب القبر من البول فتنزهوا من البول.
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Bazzar narrated it in Kashf Astar (243), Tabarani in Al-Kabir (11/84), and Hakim (1/183-184), all of them through the route of Israil, from Abu Yahya, from Mujahid, from Ibn Abbas, who said, and then he mentioned it.Abu Yahya al-Qattat is disputed, with the predominant view being that he is daif, though Yahya bin Main deemed him trustworthy in one report. He has been corroborated by Awwam bin Hawshab, from Mujahid.Tabarani narrated it in Al-Kabir (11/79) through the route of Awwam bin Hawshab, from Mujahid, from Ibn Abbas, with the same wording. Awwam bin Hawshab was deemed trustworthy by Ahmad, Ibn Main, Abu Zura, and others.Hakim did not pass any judgment on it, but rather cited it as a corroborating witness for the hadith of Abu Hurairah, which follows.