It is narrated from Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) used to perform the Duha (forenoon) prayer so regularly that we would say, "Now he (peace and blessings be upon him) will never leave it." But then he (peace and blessings be upon him) would leave it to such an extent that we would say, "Now he (peace and blessings be upon him) will not perform this prayer."