Reference: Siyar A’laam an-Nubalaa – Volume 6, Page 195
Muhammad ibn ‘Abdil-A’laasaid: Mu’tamar ibn Sulaymaan at-Teemee said to me:
If you were not from my family I would not have told you this about my father; he was steadfast in fasting every other day for forty years, and he would [also] pray the fajr prayer with the wudhoo of the ‘ishaa prayer.