The adhan has been prescribed to alert the people to the beginning of the time for prayer. In order to serve that purpose, the mu’adhdhin should have a loud voice, so that his voice will reach the largest possible number of people. In this hadith, Abu Juhayfah, Wahb ibn ‘Abdillah al-Suwa’i (may Allah be pleased with him) narrates that he saw Bilal ibn Rabah (may Allah be pleased with him) as he was giving the adhan. He saw him turning right and left as he was giving the call to prayer. According to a report narrated by Muslim, he said: I started watching his mouth as he turned this way and that – meaning, right and left – saying, Hayya ‘ala al-salah, hayya ‘ala al-falah. This indicates that the turning referred to in the hadith should only be done when reciting these two phrases; so the mu’adhdhin should turn to his right when saying “Hayya ‘ala al-salah” and to his left when saying “Hayya ‘ala al-falah.” The purpose of turning right and left is to make the voice reach as far as possible, so that the people can hear him. This hadith indicates that it is prescribed to turn right and left when giving the call to prayer, whilst saying “Hayya ‘ala al-salah” and “hayya ‘ala al-falah.”.