The Prophet (PBUH) said "And he who utters: ‘Subhan-Allahi wa bihamdihi’ (Allah is free from imperfection and His is the praise) one hundred times a day, his sins will be obliterated even if they are equal to the extent of the foam of the ocean." (Al-Bukhari and Muslim)
“Say (O Muhammad SAW to mankind): “If you (really) love Allah then follow me (i.e. accept Islamic Monotheism, follow the Quran and the Sunnah), Allah will love you and forgive you of your sins. And Allah is Oft-Forgiving, Most Merciful.” (Surah Aal-e-Imran:31)
Qur'an 3:159: So by mercy from Allah , [O Muhammad], you were lenient with them. And if you had been rude [in speech] and harsh in heart, they would have disbanded from about you. So pardon them and ask forgiveness for them and consult them in the matter. And when you have decided, then rely upon Allah . Indeed, Allah loves those who rely [upon Him].