Sayyidah Aisha (may Allah be pleased with her) said that the Messenger of Allah (peace and blessings be upon him) would sometimes leave off doing a certain act, even though he liked to do it, out of concern that other companions might see him and start practicing it, and thus it might become obligatory upon them. For example, the Messenger of Allah (peace and blessings be upon him) never performed the Duha (forenoon) prayer, but I perform it.