The Prophet ﷺ would not break his fast on the white days, whether at home or while traveling.
كان النبي ﷺ لا يفطر أيام البيض في حضر ولا سفر.
Nasai (2345) reported it from Qasim bin Zakariya, who said, "Ubaydullah told us, who said, "Yaqub told us, from Jafar, from Saeed, from Ibn Abbas," and he mentioned it.Its chain is hasan because of Yaqub, who is Ibn Abdullah Qummi, and his teacher Jafar, who is Ibn Abu Mughira Qummi. Both of them are subjects of disagreement among scholars, except that they make the hadith hasan.