question #1 Sahih Muslim 1159o, Book 13, Hadith 249 : What is the significance of balancing religious devotion with personal and familial responsibilities in Islam?

Then observe the fast of David (peace be upon him). Observe fast one day and break it (on the other) day. And he (‘Abdullah b. ‘Amr) used to say: Would that I had availed myself of this concession.