It is narrated from Sayyidah Aishah (may Allah be pleased with her) that when the Prophet (peace and blessings be upon him) heard the muezzin, he would say (in response to the two testimonies): "And I too (bear witness), and I too (bear witness)."

Sayyiduna Abu Hurayrah (may Allah be pleased with him) narrates: We were with the Messenger of Allah (peace and blessings be upon him), and Bilal (may Allah be pleased with him) stood up to give the adhan. When he fell silent, the Messenger of Allah (peace and blessings be upon him) said: "Whoever says the like of this (these words) with certainty has entered Paradise." The chain of this hadith is sahih (authentic), but the two Shaykhs (Bukhari and Muslim) did not record it in this form.