Hadith 15538
It is narrated from Sayyiduna Muawiyah bin Jahmah that once Jahmah came to the service of the Prophet (peace and blessings be upon him) and said, "O Messenger of Allah! I want to participate in jihad and have come to you for advice." The Prophet (peace and blessings be upon him) asked, "Is your mother alive?" He replied, "Yes." The Prophet (peace and blessings be upon him) said, "Then keep her service obligatory upon yourself, for Paradise is beneath her feet." The Prophet (peace and blessings be upon him) said this a second time, a third time, and even several times.