[16].Surah An-Nahl [The Bees] :Ayat 35

Ayat 35. And those who join others in worship with Allah say: "If Allah had so willed, neither we nor our fathers would have worshipped aught but Him, nor would we have forbidden anything without (Command from) Him." So did those before them. Then! Are the Messengers charged with anything but to convey clearly the Message? 

Hazrat Anas (May Allah be pleased with him) said: I heard the Messenger of Allah  [SAWW](PBUH) saying, "Allah, the Exalted, has said: `O son of Adam! I shall go on forgiving you so long as you pray to Me and aspire for My forgiveness whatever may be your sins. O son of Adam! I do not care even if your sins should pile up to the sky and should you beg pardon of Me, I would forgive you. O son of Adam! If you come to Me with an earthful of sins and meet Me, not associating anything with Me in worship, I will certainly grant you as much pardon as will fill the earth.''

[At-Tirmidhi Hadith # 3540]. 

Lesson : as mentioned above in Surah An-Nahl Ayat 35.Are the Messengers charged with anything but to convey clearly the Message? In this narration, there is good news for the sinners who do not stick to sins but rather repent and ask forgiveness from Allah. However numerous their sins may be, Allah will forgive all their sins. But there is a condition which they should fulfill, namely that they do not persist in what wrong they have done (3:135), as with persistence and repeatedly committing the sin, the act of seeking forgiveness becomes a futile act.