The Messenger (sal Allahu alaihi wa sallam) said, “I guarantee a house in the surroundings of Paradise for a person who avoids quarreling, even if he knows he is in the right.”
[Abu Dawud ~ Hadith Sahih]
This hadith shows the virtue of good manners and that the person who has good manners is rewarded with a house in paradise.
So whoever avoids quarreling for the sake of Allah, the Prophet (sal Allahu alaihi wa sallam) has guaranteed for them a house in paradise, this is because avoiding quarreling keeps the hearts closer and prevents hatred between the Muslims.
And Allah Knows Best!