Volume 1, Book 11, Number 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).”

Volume 1, Book 11, Number 610 :
Narrated ‘Aun bin Abi Juhaifa:
My father said, “I saw Bilal turning his face from side to side while pronouncing the Adhan for the prayer

Volume 1, Book 11, Number 609 :
The Prophet said, “When you hear the Iqama, proceed to offer the prayer with calmness and solemnity and do not make haste. And pray whatever you are able to pray and complete whatever you have missed.

Volume 1, Book 11, Number 610 :
Narrated ‘Abdullah bin Abi Qatada:
My father said. “Allah’s Apostle said, ‘If the Iqama is pronounced then do not stand for the prayer till you see me (in front of  you).’ ”

Volume 1, Book 11, Number 615 :
Narrated ‘Anas:
Once the Iqama was pronounced and the Prophet was talking to a man (in a low voice) in a corner of the mosque and he did not lead the prayer till (some of) the people had slept (dozed in a sitting posture).

Volume 1, Book 11, Number 618 :
Narrated ‘Abdullah bin Umar:
Allah’s Apostle said, “The prayer in congregation is twenty-seven times superior to the prayer offered by person alone.”