For 10 points, name this action that is done during the daytime during the month of Ramadan.
In Judaism, this action is sometimes performed on the "Bahab" days of the months of Marcheshvan and Iyar. In Eastern Orthodoxy, this action is most strictly mandated in conjunction with the Dormition of the Theotokos. In Judaism, this action occurs on days named for Gedaliah, Tevet, and Esther. This action, which is known as (*) ta'anit in Hebrew, must be done for a 25-hour period on Tisha B'av and Yom Kippur. In Islam, the end of a period in which this action is required is the festival of Eid Al-Adha. For 10 points, name this action that is done during the daytime during the month of Ramadan.
In Judaism, this action is sometimes performed on the "Bahab" days of the months of Marcheshvan and Iyar.
fasting [accept equivalents such as abstaining from food/drink; accept ta'anit before mentioned]