Narrated Abu Said Al-Khudri:
Allah's Apostle said, "When the believers pass safely over (the bridge across) Hell, they will be stopped at a bridge in between Hell and Paradise where they will retaliate upon each other for the injustices done among them in the world, and when they get purified of all their sins, they will be admitted into Paradise. By Him in Whose Hands the life of Muhammad is everybody will recognize his dwelling in Paradise better than he recognizes his dwelling in this world."
Allah's Apostle said, "Help your brother, whether he is an oppressor or he is an oppressed one. People asked, "O Allah's Apostle! It is all right to help him if he is oppressed, but how should we help him if he is an oppressor?" The Prophet said, "By preventing him from oppressing others."
Narrated Salim's father (i.e. 'Abdullah):
The Prophet said, "Whoever takes a piece of the land of others unjustly, he will sink down the seven earths on the Day of Resurrection."
The Prophet said, "The most hated person in the sight of Allah is the most quarrelsome person."