Great sin

According to the Quran and narrations, there are two types of sins, major sins and minor sins.

from you your (small) sins and cause you to enter an honorable (place of) entering. (Surah 4, Verse 31 Allah says in the Qur'an: “If you avoid great sins which you are forbidden, We will expiate).
Therefore, a believer must know which sins are great, so that he/ she desists from them. In this way, Allah, in His mercy and according to His promise, will forgive all his minor sins and mistakes.

Summary:Thirty great sins, which originate from tongue.the importance of correction of tongue is made clearer when we know that a large part of sins as a large part of good deeds are performed by tongue.