Sayyidina Anas (r.a.) says that once we saw that the Holy Prophet (s.a.w.) was smiling. Sayyidina Umar (r.a.) asked "O Messenger of Allah! What is the reason that you smile?" The Holy Prophet (s.a.w.) replied "Two of any people kneel down before Allah. One says to Allah "O Lord! He did me wrong. I want to be compensated." Allah tells (the oppressor) to compensate for his oppression. The oppressor says "O Lord I am left with no good deed any more to give him as compensation." The oppressed then says "O Allah! Let him carry the burden of my sins." While saying this the Holy Prophet's eyes became wet with tears and he said "It will be a day of severe hardship. People will be willing to put the burden of their sins on anyone else.
Now Allah ta'ala will say to the one seeking revenge "Raise your head and look towards Jannah!" He will raise his head and say "O Lord! It has palaces of silver and gold, made of pearls. O Lord! To which prophet or siddiq or shaheed do these palaces beong to?" Allah ta'ala will say "They are given to anyone who can pay their price." He will say "O Lord! Who can pay their price?" Allah ta'ala will say "You can pay their price." He will then say "How O Lord?" Allah Jalla Shanahu will say "By forgiving your brother." He will say " O Lord! I forgive". Allah will say "Now you both hold each others hands and enter the Jannah." Then the Holy Prophet (s.a.w.) said "Fear Allah! Make peace between yourselves because on the day of Judgement Allah ta'ala will also make peace between the believers." (Tafseer Ibn Katheer 2:269)
(From Scattered Pearls vol. 3 by Maulana Muhammad Yunus Palanpuri)