IN A NUTSHELL
Ḥukat begins with the law of the Red Heifer (a young female cow who can be used to purify us). The Sages thought the Red Heifer was the hardest of all the mitzvot in the Torah to understand, and it became the classic example of a ḥok – a mitzva with no obvious explanation.
The parasha then continues telling the story of the Israelites in the desert. After the death of Miriam, the people complain they no longer have any water. Moshe and Aharon turn to God for help, and then show impatience with the people. God judges that they have acted wrongly and tells them they will not live to enter the land of Israel. Soon after this Aharon dies a natural death, aged 123.
The people complain again and are attacked by venomous snakes. God tells Moshe to place a brass snake on a pole, so that all who look up to it will be healed. Moshe then leads the people into battle against Siḥon and then Og, and they win both battles.
QUESTION TO PONDER
Why do a mitzva if you can’t understand its purpose?