It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) entered the mosque on Friday and saw Abu Isra'il standing in the sun. He (peace and blessings be upon him) asked about him, and the people said: "He has vowed that he will stand and not sit, will not speak, will not go into the shade, and will fast." He (peace and blessings be upon him) said: "Let him sit down, speak, come into the shade, and complete his fast."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Ibn Tawus with a connected chain except Wuhayb, and Abd al-Rahman bin al-Mubarak is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الميم / 8468
Hadith Takhrij«أخرجه البخاري فى «صحيحه» برقم: 6704، وابن الجارود فى «المنتقى» برقم: 1010، وابن حبان فى «صحيحه» برقم: 4385، وأبو داود فى «سننه» برقم: 3228، وابن ماجه فى «سننه» برقم: 2136، 2136 (م)، والبيهقي فى «السنن الكبرى» برقم: 20150، 20152، والدارقطني فى «سننه» برقم: 4324، 4323، 4325، 4326، 4327، والطحاوي فى «شرح مشكل الآثار» برقم: 2168، 2167، والطبراني فى «الكبير» برقم: 10930، 11871، 12360»