Strong's numbers
λουτρόν (G3067)
loutrón
loo-tron'
from λούω; a bath, i.e. (figuratively), baptism:--washing.
Abbott–Smith
From G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922), in the public domain.
2 occurrences
Shown in the King James Version (KJV), whichever translation you read in — it is the text these numbers are tagged against.
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Ephesians 5:26
That he might sanctify and cleanse it with the washing of water by the word,
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Titus 3:5
Not by works of righteousness which we have done, but according to his mercy he saved us, by the washing of regeneration, and renewing of the Holy Ghost;