Among the Seven Festivals in Israel, God chose July 10, right after the Festival of Trumpets, as the Day of Atonement every year.
Once a year, the high priest enters the Most Holy Place on the Day of Atonement and asks for atonement for all the Israelites before the atonement cover of the ark.
Leviticus 16 29:34:
"This is to be a lasting ordinance for you: On the tenth day of the seventh month you must deny yourselves and not do any work--whether native-born or an alien living among you- because on this day atonement will be made for you, to cleanse you. Then, before the LORD, you will be clean from all your sins. It is a Sabbath of rest, and you must deny yourselves; it is a lasting ordinance. The priest who is anointed and ordained to succeed his father as high priest is to make atonement. He is to put on the sacred linen garments and make atonement for the Most Holy Place, for the Tent of Meeting and the altar, and for the priests and all the people of the community. "This is to be a lasting ordinance for you: Atonement is to be made once a year for all the sins of the Israelites." And it was done, as the LORD commanded Moses.
The ordinance of offerings on the Day of Atonement is: the high priest to prepare a young bull for himself and his household as a sin offering and a ram for a burnt offering; as well as to prepare two male goats for the whole country, Israel.
Leviticus 16 :1-10:
The LORD spoke to Moses after the death of the two sons of Aaron who died when they approached the LORD. The LORD said to Moses: "Tell your brother Aaron not to come whenever he chooses into the Most Holy Place behind the curtain in front of the atonement cover on the ark, or else he will die, because I appear in the cloud over the atonement cover. "This is how Aaron is to enter the sanctuary area: with a young bull for a sin offering and a ram for a burnt offering. He is to put on the sacred linen tunic, with linen undergarments next to his body; he is to tie the linen sash around him and put on the linen turban. These are sacred garments; so he must bathe himself with water before he puts them on. From the Israelite community he is to take two male goats for a sin offering and a ram for a burnt offering. "Aaron is to offer the bull for his own sin offering to make atonement for himself and his household. Then he is to take the two goats and present them before the LORD at the entrance to the Tent of Meeting. He is to cast lots for the two goats--one lot for the LORD and the other for the scapegoat. Aaron shall bring the goat whose lot falls to the LORD and sacrifice it for a sin offering. But the goat chosen by lot as the scapegoat shall be presented alive before the LORD to be used for making atonement by sending it into the desert as a scapegoat.
According to the sacrifice rituals, these two male goats are used to make atonement for all the Israelites. One of the male goats has to be slaughtered and offered to the Lord as a sin offering. For the other male goat that is alive, the high priest will lay his hands on the head of the goat to put all the sins of the Israelites onto it. Then, the male goat will be sent to the desert where nobody lives, and will be given to Azazel, which means Devil in the Desert.
Leviticus 16 :20-22: "When Aaron has finished making atonement for the Most Holy Place, the Tent of Meeting and the altar, he shall bring forward the live goat. He is to lay both hands on the head of the live goat and confess over it all the wickedness and rebellion of the Israelites--all their sins--and put them on the goat's head. He shall send the goat away into the desert in the care of a man appointed for the task. The goat will carry on itself all their sins to a solitary place; and the man shall release it in the desert.
The scapegoat that is sent to the desert prophesies that there will be a group of believers who are not qualified to have salvation during the time of rapture in the end times and in the end, they will be left behind in the “desert.”