Sung at the beginning of the Yom Kippur service, the Kol Nidre states:
"All vows we are likely to make, all oaths and pledges we are likely to take between this Yom Kippur and the next Yom Kippur, we publicly renounce. Let them all be relinquished and abandoned, null and void, neither firm nor established. Let our vows, pledges and oaths be considered neither vows nor pledges nor oaths."