Chukat, HuQath , Hukath, or Chukkas (חֻקַּת ‎—Hebrew for "decree," the ninth word, and the first distinctive word, in the parashah) is the 39th weekly Torah portion (פָּרָשָׁה‎, parashah) in the annual Jewish cycle of Torah reading and the sixth in the Book of Numbers. The parashah sets out the laws of corpse contamination (tumat hamet) and purification with the water of lustration prepared with the Red Cow (פָרָה אֲדֻמָּה‎, parah adumah, also called the "Red Heifer"). It also reports the deaths of Miriam and Aaron, the failure of Moses at the Waters of Meribah, and the conquest of Arad, the Amorites, and Bashan. The parashah comprises Numbers 19:1–22:1. The parashah is the shortest weekly Torah portion in the Book of Numbers (although not the shortest in the Torah), and is made up of 4,670 Hebrew letters, 1,245 Hebrew words, 87 verses, and 159 lines in a Torah Scroll (סֵפֶר תּוֹרָה‎, Sefer Torah).

Jews generally read it in late June or July. In most years (for example, in 2025 and 2028), Parashat Chukat is read separately. In some years (for example, 2026 and 2027) when the second day of Shavuot falls on a Sabbath in the Diaspora (where observant Jews observe Shavuot for two days), Parashat Chukat is combined with the subsequent parashah, Balak, in the Diaspora to synchronize readings thereafter with those in Israel (where Jews observe Shavuot for one day).

Jews also read the first part of the parashah, Numbers 19:1–22, in addition to the regular weekly Torah portion, on the Sabbath after Purim, called Shabbat Parah. On Shabbat Parah, a reader reads the regular weekly Torah portion first, and then a reader reads the chapter of the Red Cow. Shabbat Parah occurs shortly before Passover, and Numbers 19:1–22 sets out the procedure by which the Israelites could purify themselves from the impurity of death (tumat hamet), and so prepare for the Pilgrimage Festival of Passover.

In traditional Sabbath Torah reading, the parashah is divided into seven readings, or עליות‎, aliyot.

In the first reading, God told Moses and Aaron to instruct the Israelites regarding the ritual law of the Red Cow (פָרָה אֲדֻמָּה‎, parah adumah) used to create the water of lustration. The cow was to be without blemish, have no defect, and not have borne a yoke. Eleazar the priest was to take it outside the camp, observe its slaughter, and take some of its blood with his finger and sprinkle it seven times toward the Tabernacle. The cow was to be burned in its entirety along with cedar wood, hyssop, and crimson wool. The priest and the one who burned the cow were both to wash their garments, bathe in water, and be unclean until evening. The ashes of the cow were to be used to create the water of lustration. One who touched the corpse of any human being was to be unclean for seven days. On the third and seventh days, the person who had touched the corpse was to cleanse with the water of lustration and then be clean. One who failed to do so would remain unclean, would defile the Tabernacle, and would be cut off from Israel. When a person died in a tent, whoever entered the tent was to be unclean seven days, and every open vessel in the tent was to be unclean. In the open, anyone who touched a corpse, bone, or a grave was to be unclean seven days.

In the second reading, a person who was clean was to add fresh water to ashes of the Red Cow, dip hyssop it in the water, and sprinkle the water on the tent, the vessels, and people who had become unclean. The person who sprinkled the water was then to wash his clothes, bathe in water, and be clean at nightfall. Anyone who became unclean and failed to cleanse himself was to be cut off from the congregation. The person who sprinkled the water of lustration was to wash his clothes, and whoever touched the water of lustration, whatever he touched, and whoever touched him were to be unclean until evening. The Israelites arrived at Kadesh in the wilderness of Zin, and Miriam died and was buried there. The people were without water, and they complained against Moses and Aaron. Moses and Aaron fell on their faces at the entrance of the Tent of Meeting, and the Presence of God appeared to them.

In the third reading, God told Moses that he and Aaron should take the rod and order the rock to yield its water. Moses took the rod, assembled the congregation in front of the rock, and said to them: "Listen, you rebels, shall we get water for you out of this rock?" Then Moses struck the rock twice with his rod, out came water, and the community and their animals drank. But God told Moses and Aaron: "Because you did not trust Me enough to affirm My sanctity in the sight of the Israelite people, therefore you shall not lead this congregation into the land that I have given them." The water was named Meribah, meaning quarrel or contention."

In the fourth reading, Moses sent messengers to the king of Edom asking him to allow the Israelites to cross Edom, without passing through fields or vineyards, and without drinking water from wells. But the Edomites would not let the Israelites pass through, and turned out in heavy force to block their way, and the Israelites turned away.