Nedarim

Come and hear; IF SHE VOWED AS AN ARUSAH, WAS DIVORCED ON THAT DAY AND BETROTHED [AGAIN] ON THE SAME DAY, EVEN A HUNDRED TIMES, HER FATHER AND HER LAST HUSBAND CAN ANNUL HER VOWS; this proves that divorce is the equivalent of silence, for if it is as confirmation, can the second arus annul vows which the first arus confirmed?  — No. This refers to a case where the first arus did not hear thereof. If so, why particularly state ON THE SAME DAY? The same holds good even after a hundred days! — This refers to a case where the arus did not hear thereof, but her father did; so that he can annul only on the same day, but not afterwards. Come and hear: If she vowed on one day, and he divorced her on the same day and took her back on the same day, he cannot annul it.  This proves that divorce is as confirmation! — I will tell you. This refers to a nesu'ah,  and the reason that he cannot annul is because a husband cannot annul pre-marriage vows.