The 1967 crash that killed Jayne Mansfield became one of the most consequential accidents in highway safety history. In the early hours of June 29, Mansfield was traveling in a Buick Electra along a dark stretch of U.S. Highway 90 near New Orleans when the car slammed into the rear of a slow moving tractor trailer. The vehicle rode underneath the trailer in what is known as an underride collision, shearing off the top of the car and instantly killing Mansfield and two others in the front seat. At the time, trucks lacked any structural barrier to prevent smaller vehicles from sliding beneath them, and the crash starkly exposed how catastrophic that design gap could be.

The public reaction was swift and lasting. Within a few years, U.S. regulators mandated rear underride guards on large trucks, soon widely known as Mansfield bars, to block passenger vehicles from penetrating beneath trailers in rear end collisions. This single design intervention significantly reduced fatalities in similar crashes and became standard not only in the United States but in many markets worldwide. Beyond the specific hardware fix, the Mansfield crash helped shape a broader recognition of crash compatibility, the idea that vehicles of different sizes and heights must be engineered to interact safely, which continues to influence truck design, bumper alignment standards, and ongoing efforts to improve side underride protection today.

The Mansfield crash became a defining moment in automotive safety not only because of its tragedy, but because of what it revealed about proximity and limits. The car did not simply collide with a truck, it went under it. The danger was not just speed or impact, but getting too close to something structurally higher, heavier, and unyielding. In response, the industry imposed clearer boundaries in steel, underride guards designed to enforce a separation that human judgment had failed to maintain.

In this week’s Torah reading, titled Shemini (Leviticus chapters 9-11) we have a parallel event. Moses’ brother Aaron is consecrated as the High Priest, the Kohen Gadol. His sons are likewise established as priests, as Kohens. However, two of these Kohens, Nadav and Avihu, get too close. They step forward during the consecration ceremony, bringing fire that was not commanded, entering a space of closeness to God that had not been defined for them. Like a vehicle slipping beneath the rear of a truck, they cross a threshold that exists whether or not it is acknowledged. The result is immediate and final. A divine fire strikes them down and kills them on the spot.

Both scenes revolve around a similar dynamic. There is such a thing as being near, and there is such a thing as being too near. The difference is not always marked by instinct, and often only becomes clear in retrospect. Whether in physical systems or sacred ones, boundaries are not suggestions. They are conditions for survival.

The full reading of Shemini (which literally means ‘eighth’) starts on the eighth day of consecration of the Tabernacle in the desert and the induction of Aaron and his sons into their role.

On the eighth day, Aaron, his sons, and the elders gather at the Tent of Meeting. Aaron brings offerings for himself and the people, including sin offerings, burnt offerings, peace offerings, and a meal offering, all prepared for the moment when the Divine presence will appear.

Aaron begins the service, offering first for himself and then for the people. The blood is applied to the altar, portions are burned, and the offerings are carried out in their proper order. The people’s sacrifices follow in the same pattern, with the altar receiving the blood and the designated parts burned, while other portions are set aside.

When the service is complete, Aaron blesses the people. He and Moses enter the Tent of Meeting and then emerge again to bless the nation. The glory of God appears to all the people, and fire comes out from before God and consumes the burnt offering and the fat on the altar. All the people see it, shout, and fall on their faces.

Then Nadav and Avihu bring their own fire, which had not been commanded. A fire comes forth and consumes them, and they die before God. Moses tells Aaron that this is what God spoke, saying that through those who are near to Him will be sanctified, and before all the people He will be glorified. Aaron remains silent.

Moses calls Mishael and Elzaphan, the sons of Aaron’s uncle Uzziel, and tells them to carry their relatives away from the front of the sanctuary to outside the camp. They come near and carry them away in their tunics.

Moses tells Aaron and his remaining sons, Elazar and Itamar, not to let their hair grow wild and not to tear their garments (typically signs of mourning), so that they will not die and so that wrath will not come upon the entire congregation. The house of Israel is to bewail the burning that God has kindled. They are not to leave the entrance of the Tent of Meeting lest they die, because the anointing oil of God is upon them (as newly consecrated Kohens). They do as Moses says.

Aaron and his sons are then instructed not to drink wine when entering the Tent of Meeting, and to distinguish between the holy and the common, and between the unclean and the clean, teaching these distinctions to the people.

Instructions follow regarding the portions of offerings that are to be eaten by the Kohens, and where they may be eaten. When it is discovered that a sin offering was burned rather than eaten, Moses gets angry with Elazar and Itamar. Aaron explains his reasoning for why they shouldn’t have eaten that offering after the death of Nadav and Avihu, and it is accepted by Moses.

The focus then shifts to the laws of permitted and forbidden foods. Land animals must have split hooves and chew the cud to be eaten. But animals that only chew the cud or only have a split hoof are not to be eaten. The camel, the hyrax, and the hare chew the cud but do not have split hooves and are unclean. The pig has a split hoof but does not chew the cud and is unclean. Their flesh is not to be eaten, and their carcasses are not to be touched.

Creatures in the water must have fins and scales. A long list of forbidden birds is given, and most insects are prohibited except for specific types of locusts. Various laws describe how impurity is transmitted through contact with carcasses and how vessels and food are affected. It specifies how impurity is transferred and how objects are to be treated if they become unclean.

The section concludes with the call to holiness. The people are to avoid impurity and distinguish between what is clean and unclean, because the God who brought them out of Egypt is holy, and they are to be holy as well.

Next week, we get into more laws of purity and cleanliness, starting with a woman after childbirth and the distinctions whether the baby is a boy or a girl.