you are supposed to first rinse your body outside the bath tub with the shower or a washbowl. Afterwards, you enter the tub, which is used for soaking only. The bath water tends to be relatively hot, typically between 40 and 43 degrees.
After soaking, leave the tub and clean your body with soap. Make sure that no soap gets into the bathing water. Once you finished cleaning and have rinsed all the soap off your body, enter the bath tub once more for a final soaking.