What does Numbers 5:22 mean?

May this water bring a curse if you’ve lied—if you’re guilty, your body will show it, and everyone will know what happened. The woman has to say, 'Amen, let it be so.' Numbers 5:22 - Modern Text Bible

(This is the conclusion of the ritual for a woman suspected of adultery. She agrees to the consequences if she’s guilty, accepting the outcome as fair.)