On the four public fast days (apart from the 9th of Ab), the Torah portion of Wayhal Moshe (Shemoth 32:11-14 and...
Monday, January 2, 2012/Tebeth 7, 5772

Neither a vow nor an oath may be annulled before the time that the vow or oath actually comes into effect....
Wednesday, January 12, 2011/Shebat 7, 5771