To offer up an additional sacrifice on the Day of the Fast (Day of Atonement)

Numbers 29:7–8

KJV

And ye shall have on the tenth day of this seventh month an holy convocation; and ye shall afflict your souls: ye shall not do any work therein: But ye shall offer a burnt offering unto the LORD for a sweet savour; one young bullock, one ram, and seven lambs of the first year; they shall be unto you without blemish:

ASV

And on the tenth day of this seventh month ye shall have a holy convocation; and ye shall afflict your souls: ye shall do no manner of work; but ye shall offer a burnt-offering unto Jehovah for a sweet savor: one young bullock, one ram, seven he-lambs a year old; they shall be unto you without blemish;

WEB

“‘On the tenth day of this seventh month you shall have a holy convocation. You shall afflict your souls. You shall do no kind of work; but you shall offer a burnt offering to the LORD for a pleasant aroma: one young bull, one ram, seven male lambs a year old, all without defect;

JPS

And on the tenth day of this seventh month ye shall have a holy convocation; and ye shall afflict your souls; ye shall do no manner of work; but ye shall present a burnt-offering unto the LORD for a sweet savour: one young bullock, one ram, seven he-lambs of the first year; they shall be unto you without blemish;