The expression means washing both hands up to the wrists three times before starting wudu, particularly before putting them into a water vessel after waking from sleep.
This beginning-of-wudu sunnah must not be confused with the fard of washing the arms up to the elbows. The juristic reasoning also considers the unknown state of the sleeping person's hands and the protection of water in the vessel.
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Sunnahs of Wudu and Their Juristic Rulings
The expression means washing both hands up to the wrists three times before starting wudu, particularly before putting them into a water vessel after waking from sleep.
This beginning-of-wudu sunnah must not be confused with the fard of washing the arms up to the elbows. The juristic reasoning also considers the unknown state of the sleeping person's hands and the protection of water in the vessel.