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How to baptize someone
Fill the baptistry with warm water ahead of time.
You'll need to fill the baptistry early enough that it has time to fill, which could take 20-30 minutes. At the same time, don't fill it so early that the water gets cold, unless the baptistry is equipped with a heater.
Ignore this part if you are not using a baptistry. Baptisms can be performed in any standing body of water such as the ocean, a pool, or a river.