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If you are just looking for the origins of the quote there are two possibilities:
Sir Francis Bacon in 1605 in Advancement of Learning mentions
For cleanliness and decency of the body were always allowed to proceed from moral modesty and reverence; first, toward God, whose creatures we are; next, toward society, wherein we live; and lastly, toward ourselves, whom we ought to reverence still more than others.
John Wesley in On Dress mentions 'cleanliness is indeed next to godliness' in 1791.
See also Phrase Meaning and Origin or a similar question on English SE.
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Isaiah 52: 11:
Depart ye, depart ye, go ye out from thence, touch no unclean thing; go ye out of the midst of her; be ye clean, that bear the vessels of the Lord.
This can be interpreted symbolically, but that really doesn't help you much.
On the other hand, you can always ask her (nicely) to take it easy about judging your ideas of what is important. (Matthew 7, if it's not on the tip of your tongue:)
Judge not, that ye be not judged.
But remember, it's a two-edged sword:
For with what judgment ye judge, ye shall be judged: and with what measure ye mete, it shall be measured to you again.
You have to be careful how you judge your wife's attempts to help you be a better person.
Upvote:2
The ceremonial precepts of the Old Law included ritual washings not because cleanliness was the end sought in an of itself but because the ceremonial precepts were meant to teach the ancient Israelites of a spiritual reality, such as sin (dirtiness) and the purity (cleanliness) resulting from God's forgiveness.
In the New Law, only the sacramental aspect of baptism is a mere washing.