What is the ruling on one who vows an act of obedience to perform it every time he commits a specific sin, but then becomes unable to fulfill his vow? And is one rewarded if his engagement in worship hinders him from excelling in his studies, and does this apply if his vow obliges him to do so? And if the vow conflicts with obedience to parents, which takes precedence? And is it permissible to gradually commit to the vow if that is deemed more appropriate?

Drinking alcohol is strictly forbidden due to its impurity and harm. The Prophet, peace and blessings be upon him, cursed its drinker and whoever assists in it. Whoever drinks it, their prayer is not accepted for forty days. It is obligatory to stop drinking alcohol. If a Muslim vows an act of obedience conditioned on committing a sin, and then commits that sin, they are given a choice between performing the act of obedience or expiating by offering an oath atonement. A Muslim should strive in their studies and excel in their work. Obedience to parents is obligatory unless they command a sin, and if it conflicts with an obligation like a vow, the obligation takes precedence.