Is it in The Bible?
Yes. Then it must obey what The Bible says or it is error and possibly heretical.
No. Then it must pass all of the following tests and be Biblical practice where it is in The Bible as a practice. It cannot be doctrine or enforceable on anyone but may be a denominational or church requirement.
The Tests used in this book when the belief or practice is not mentioned in The Bible
Other sources that may help:
What does the Old Testament say about it
What do the early church documents say about it