Imagine the most sacred job you could have. What would you wear? God had very specific instructions for the priests serving Him, and it started with their clothing.
The priest was required to wear specific linen garments, including his undergarments, for the task of tending to the ashes of the burnt offering. These weren't just any clothes; they were sacred vestments signifying purity and holiness. This attire was essential because the priest was entering a holy space and performing a solemn duty connected to the sacrifices that dealt with sin. Even in the mundane task of cleaning up after a sacrifice, the priest had to embody the holiness of God and the seriousness of sin.
The linen garments symbolized the purity required to approach a holy God. This points forward to Jesus, our ultimate High Priest, who was perfectly pure and holy, fitting Him to offer the perfect sacrifice for sin.