It is narrated from Sayyiduna Jabir (may Allah be pleased with him) that once Sayyiduna Ibn Umm Maktum came to the service of the Prophet (peace and blessings be upon him) and said, "O Messenger of Allah! My house is far, I cannot see, but I do hear the call to prayer." The Prophet (peace and blessings be upon him) said, "If you hear the call to prayer, then respond to its call, even if you have to come crawling on your knees."