For 10 points, name this month of fasting in Islam.
Denouncing someone behind his or her back offsets the benefit gained from observing it, and one of the practices it prohibits can be done until a white thread is easily distinguishable from a black one. One of its days marks the time that a certain object was revealed to Samaa Adunya; that "Night of Measures" is known as the Laylat al-Qadr. Six nonconsecutive days of Shawwal follow it, and the main activity during it is known as sawm. It ends with the iftar, but it is ceremoniously broken by the Eid ul-Fitr. For 10 points, name this month of fasting in Islam.
Denouncing someone behind his or her back offsets the benefit gained from observing it, and one of the practices it prohibits can be done until a white thread is easily distinguishable from a black one.
{Ramadan} [or {Ramazan}