What is holy and not holy? What is clean and not clean? Both are defined by God alone. Heaven sets up appointments for His people to meet with Him and how they are to prepare themselves and show up at the appointed times in the appointed ways.
A key lesson of the Torah reading שמיני Shemini (“eighth,” Leviticus 9–11) is the leaders of the people, such as the priests, kings and nobles are called to a higher standard, because of their higher education and proximity to God than the common people.
It is our duty as those who consider ourselves citizens of the Kingdom of Heaven to know our position and to know and follow the Torah instructions that apply to us.