Yom Kippur, or the Day of Atonement, is among the most sacred. You can find the command on how God told the Israelites to observe this day in Leviticus 16. This was the only day the high priest could enter the Holy of Holies.

Can you imagine how heavy the sense of sin and unworthiness must have been for him? To know that he was entering the presence of a holy God on behalf of an entire nation who had sinned? And yet, every year, without fail, he went in.