Leviticus 16:30
[30] For on this day shall atonement be made for you to cleanse you. You shall be clean before the LORD from all your sins. (ESV)
The Day of Atonement was the most important day of the year for the people of God. It was the day that the Lord would ceremonially put away the sin of His people. The people’s sin would be placed on two goats. One goat was slaughtered, signifying that sin must be paid for with death. The other goat was sent away into the wilderness, signifying that sin eternally separates us from God. The Day of Atonement pointed forward to the Son of God who would be slaughtered and cast away from His heavenly Father that we might be welcomed into the household of God.
For his role in the day of atonement, the High Priest of Israel needed to wear special clothing. Normally, the High Priest was dressed impressively. According to Exodus 28:2, he wore items made with pure gold, colorful yarns, and expensive gems. The High Priest’s clothing was to be the most beautiful, glorious garments in the nation.
On the Day of Atonement, the most important day of the year, one would imagine that the High Priest might wear something even more glorious. But instead, he wears clothes of linen (Leviticus 16:4). This clothing was plain and simple, more simple than what an ordinary priest would wear.
See, among men, the High Priest was the holiest, most exalted person in the nation. But before God, he was not so impressive. In fact, he’s no one. Imagine a guest shows up to a wedding wearing a dazzling, white dress. This would be out of place. This guest would want people to notice them but all they would be doing is drawing attention to the fact that they are not the bride. In a similar way, nothing is more out of place, nothing draws more attention to our lack than to come before God trying to show off our own righteousness and goodness.
Isaiah 64:6 tells us that all our righteous acts are like filthy rags before God. This verse is not talking about the worst parts of us, but our very best. Our greatest strengths, our most noble sacrifices, our most holy prayers are filthy rags compared to the blinding holiness of the Lord of glory. No one can stand before God. No one can boast. For all have sinned and fall woefully short of the glory of God. We do not flaunt ourselves before Him. We bow.