Musnad Abu Ya'la al-Mawsili 109:74

Ja'far ibn Humayd narrated to us, Ya'qub narrated to us, from 'Isa ibn Jariyah, from Jabir, who said: Ibn Umm Maktum came to the Prophet, may Allah bless him and grant him peace, and said: "O Messenger of Allah, I am blind, my house is far away, and I hear the Adhan." He said: "If you hear the Adhan, then answer it, even if by crawling, and even if by creeping."