Hadith 449
´'Ubaidullah bin Abu Rafi' narrated from his father that:` Whenever the Messenger of Allah performed ablution, he moved his ring.
Hadith 732
´It was narrated that Abu Rafi' said:` "I saw Bilal calling the Adhan in fron of Allah's Messenger, (saying the phrases) two by two, and saying each phrase once in the Iqamah."