Lay on Hands is a paladin class feature.
A paladin with the Lay on Hands class feature chooses one of the following powers to learn: lay on hands, ardent vow, or virtue's touch.
Using the lay on hands power, paladins can grant their comrades (or themselves) additional resilience with a touch of their hands and a short prayer, though they must give of their own strength to do so.[PH:91]