Acharey mot - After the death of Aaron’s two sons, G-d directed Moses to instruct the Levites and priestson the rituals of purification and atonement, including the special practices performed by the high priest on Yom Kippur. The ritual of the scapegoat enabled the priest to atone for the sins of Israel. Through Moses, G-d commanded the people to abstain from forbidden sexual relations, lest they defile themselves and their land as did the people of Egypt and Canaan. The Lord spoke to Moses after the death of the two sons of Aaron who died when they drew too close to the presence of the Lord. G-d said, “Tell your brother Aaron that he is not to come at will into the Shrine behind the curtain, in front of the cover that is upon the ark. Instead, Aaron shall only enter the holy Shrine when he is clean and dressed in his sacred garments.
Kedoshim - G-d tells Moses to give the people a series of ethical and ritual laws instructing them in how to be holy. The Lord has just told Moses to tell the Israelites about the law commanding an annual Day of Atonement and sexual prohibitions. The Lord told Moses, Speak to the whole Israelite community and say to them: You shall be holy, for I, the Lord your God, am holy. You shall each revere your mother and your father, and keep My Sabbaths. Do not turn to idols or make molten gods for yourselves. I, the Lord, am your God. When you reap the harvest of your land, you shall not reap all the way to the edges of your field, or gather the gleanings of your harvest. You shall not pick your vineyard bare. You shall leave them for the poor and the stranger.