What is the ruling on one who vows to dedicate his life to the call to Allah (Da'wah) if he recovers from an illness? Is he obligated to restrict Da'wah to giving lectures and lessons, or is it permissible for him to pursue other avenues of Da'wah such as articles and mobile text messages? Is it permissible to delay fulfilling the vow to complete his studies and prepare a master's thesis? Does dedicating one's life to Da'wah mean abandoning permissible things like sleep and recreation? What is the ideal way to fulfill the vow without extremism? Is being preoccupied with a master's thesis sinful due to its distraction from the vow?

Devoting one's life to Allah and to inviting people to Him is achieved by adhering to the Prophet’s guidance and Sunnah. Religion is ease, and whoever is excessive will be overcome. The Prophet (peace and blessings be upon him) condemned those who are extreme.

Therefore, if the questioner exerts her utmost effort to remain steadfast in obedience to Allah and in inviting people to Him, she will have fulfilled her vow. This does not contradict natural and human needs such as sleep, eating, marriage, and seeking knowledge (Master’s degree).

Everyone who has a right should be given their due. Knowledge is essential for da‘wah (inviting to Islam). It is not a condition for the da‘i (one who invites) to be a profoundly knowledgeable scholar; rather, everything one does to convey from Allah and His Messenger, and to clarify His religion and law, falls under da‘wah.

If the questioner falls short in da‘wah, she must offer an expiation for breaking an oath.