Nedarim

An objection is raised: Which is the bond mentioned in the Torah?  If one says, 'Behold! I am not to eat meat or drink wine, as on the day that my father or teacher died,' [or] 'as on the day when Gedaliah the son of Ahikam was slain,'  [or] 'as on the day that I saw Jerusalem in ruins.' Now Samuel commented thereon: Providing that he was under a vow in respect to that very day.  What does this mean? Surely that e.g., he stood thus on a Sunday, on which day his father had died, and though there were many permitted Sundays, it is taught that he is forbidden; this proves that the original [Sunday] is referred to.  — Samuel's dictum was thus stated: Samuel said, Providing that he was under a vow uninterruptedly since that day. Rabina said, Come and hear: [If one says, 'This be unto me] as Aaron's dough  or as his terumah', he is permitted.  Hence, [if he vowed,] 'as the terumah of the loaves of the thanksgiving-offering,'  he would be forbidden.