Obeying and Keeping God's Commandments Saves One From Diseases

Exodus 15:26 "He said, "If you will listen carefully to the voice of the Lord your God and do what is right in his sight, obeying his commands and keeping all his decrees, then I will not make you suffer any of the disease I sent on the Egyptians; for I am the Lord who heals you.

To stay clean, one must abstain from sexual intercourse - Exodus 19:15