Yom Kippur

...In the seventh month, on the tenth day of the month, you shall afflict your souls, and you shall not do any work ... For on that day he shall provide atonement for you to cleanse you from all your sins before the L-RD.

-Leviticus 16:29-30

Yom Kippur is probably the most important holiday of the Jewish year. Many Jews who do not observe any other Jewish custom will refrain from work, fast and/or attend synagogue services on this day. Yom Kippur occurs on the 10th day of Tishri. The holiday is instituted at Leviticus 23:26 (read more at this link).

A special version of the Al Chet, a confession of sins featuring a series of statements, is recited several times during the course of Yom Kippur. Each line begins with “For the sin which we have committed before you…”

"For the sin which we have committed before you under duress or willingly.

And for the sin which we have committed before you by hard-heartedness.

For the sin which we have committed before you inadvertently.

And for the sin which we have committed before you with an utterance of the lips.

For the sin which we have committed before you with immorality.

And for the sin which we have committed before you openly or secretly.

For the sin which we have committed before you with knowledge and with deceit.

And for the sin which we have committed before you through speech."