The Messenger of Allah ﷺ would come to the washbasin and bathe from it to remove ritual impurity after morning had come, then he would continue that day fasting.
حدثنا هشيم عن سيار عن الشعبي
كان رسول الله ﷺ يأتي المخضب فيغتسل منه من الجنابة بعدما يصبح ثم يظل يومه ذلك صائما
No references are available.
Its isnad is sahih. Sayyar is Ibn Abu Sayyar Anazi, Abu Hakam, and he is trustworthy, his hadith is found in the collections of the group (al-Jamaah). The hadith previously appeared at 25104.