All things are lawful for me, but all things are not expedient: all things are lawful for me, but all things edify not. 1 Corinthians 10:23
Unto the pure all things are pure: but unto them that are defiled and unbelieving is nothing pure; but even their mind and conscience is defiled. Titus 1:15
Then LORD saw everything is good. The creatures clean for food may be unclean for other purposes. The horse, donkey, camel are impure to eat but clean for ride and domestication.Dog and cat are unclean to eat and sacrifice but clean to pet.Clean dove, bull, sheep, goat fit for eating and sacrificing are unsuitable, unfit and impure for riding? It’s not nature; it’s function that makes pure or impure. Jesus said be shrewd as snake but did not ask to eat and domesticate. Be timid as sheep but did not say ride it while preaching. Not all pure creatures to eat were pure for sacrifice for example a deer. Similarly the Tree of knowledge evil and good was impure for eating but pure for decorations in Garden of Eden. The Tree of Life was pure but again wasn’t meant for knowledge of evil and good to bring death. God punished Uzziah king when he tried to offer sacrifices in the temple because he was impure to sacrifice. On the other hand Levites were unfit and unclean for ruling the kingdom.There are clean and unclean actions.So it’s the purpose that determines purity.GOD tried to summarized some good and evil actions by Law and Christ perfected it being good. So only ONE is pure. That is CHRIST! When man wears woman’s clothe it is impure and vice versa. Imagine a man with bra on his chest.