It is narrated from the Mother of the Believers, Sayyidah Aishah (may Allah be pleased with her), that the Prophet (peace and blessings be upon him) said: "Indeed, pain in the flank is (an ailment of) the vein of the kidney; when it stirs, it hurts the one who has it, so treat it with very hot water."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Imam al-Zuhri (may Allah have mercy on him) except Abd al-Rahman (may Allah have mercy on him), and Muslim (bin Khalid al-Zanji) (may Allah have mercy on him) is alone in narrating it."
In the printed Dar al-Haramayn edition it is written thus as (Abd al-Rahman bin Umar), whereas the correct name is (Abd al-Rahman bin Muhammad).
Hadith Referenceالمعجم الأوسط / باب الألف / 113
Hadith Takhrij«أخرجه الحاكم فى «المستدرك» برقم: 8331، والطبراني فى «الأوسط» برقم: 4221»