The Messenger of Allah ﷺ said, "Any pilgrim in the state of ihram who exposes himself to the sun throughout the day, calling out the talbiyah until the sun sets, his sins set with it, and he returns as pure as the day his mother bore him."
حدثنا إبراهيم بن المنذر الحزامي حدثنا عبد الله بن نافع وعبد الله بن وهب ومحمد بن فليح قالوا حدثنا عاصم بن عمر بن حفص عن عاصم بن عبيد الله عن عبد الله بن عامر بن ربيعة
قال رسول الله ﷺ ما من محرم يضحى لله يومه يلبي حتى تغيب الشمس إلا غابت بذنوبه فعاد كما ولدته أمه
No references are available.
Its isnad is daif. Khatib narrated it in Muwaddih Awham al-Jam wal-Tafriq (1/159) from the hadith of Asim bin Umar, and he is daif as stated in Taqrib, and Busiri graded it daif because of him, and also because of Asim bin Ubaydullah, as mentioned previously, (h: 907).