´It was narrated from Usamah bin Zaid:` That the Messenger of Allah used to fast continually and it ws said that he would not break his fast, and he used not to fast and it was said that he would not fast.
Hadith ReferenceSunan an-Nasa'i / The Book of Fasting / Hadith: 2361
Hadith Gradingالألبانی:حسن صحيح | زبیر علی زئی:إسناده حسن