Hadith 680
´It was narrated from Sa'd bin Abi Waqqas that the Messenger of Allah (S.A.W) said:` "Whoever says, when he hears the Mu'adhdhin: 'Ashhadu an la ilaha illallah wahdahu la sharika lahu wa anna Muhammadan 'abduhu wa Rasuluhu, raditu Billahi Rabban, wa bil-Islami dinan was bi Muhammadin Rasula (I bear witness that there is none worthy of worship except Allah alone, with no partner or associate, and that Muhammad is the His slave and Messenger; I am content with Allah as my Lord, Islam as my religion and Muhammad as my Messenger),' his sins will be forgiven."
Hadith 857
´It was narrated that 'Uthman bin 'Affan said:` "I heard the Messenger of Allah (ﷺ) say: 'Whoever does wudu' properly, then walks to (attend) the prescribed prayer, and prays with the people or with the congregation or in the Masjid, Allah will forgive him his sins."