It is narrated from Sayyiduna Ka'b bin Ujrah (may Allah be pleased with him) that a blind man came to the Prophet (peace and blessings be upon him) and said: "O Messenger of Allah, I hear the call (adhan), but perhaps I may not find anyone to guide me." He (peace and blessings be upon him) said: "When you hear the call, then respond to the caller of Allah."
Hadith Referenceالمعجم الكبير للطبراني / باب الكاف / 16354