It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that once he was with the Prophet (peace and blessings be upon him) in an upper region of Yemen when Hazrat Bilal (may Allah be pleased with him) stood up to give the call to prayer (adhan). When he finished giving the adhan and became silent, the Prophet (peace and blessings be upon him) said: Whoever says these words with the certainty of heart as Bilal has said, he will enter Paradise.