Sahih Bukhari
Call to Prayers (Adhaan)
Volume: 001 / Book Number: 011 / Hadith Number: 631
Narrated Abu Huraira:
The Prophet said, "Allah will prepare for him who goes to the mosque (every) morning and in the afternoon (for the congregational prayer) an honorable place in Paradise with good hospitality for (what he has done) every morning and afternoon goings.