Call to Prayers (Adhaan)

Bukhari :: Book 1 :: Volume 11 :: Hadith 600

Narrated 'Abdullah bin Mughaffal:

The prophet said, "There is a prayer between the two Adhans (Adhan and Iqama), there is a prayer between the two Adhans." And then while saying it the third time he added, "For the one who wants to (pray)."