Yes, you must show mercy to others. If you do not show mercy, then God will not show mercy to you when he judges you. But the one who shows mercy can stand without fear before the Judge.
“But the first servant refused to be patient. He told the judge that the other servant owed him money, and that servant was put in jail until he could pay everything he owed.
“This king did the same as my heavenly Father will do to you. You must forgive your brother or sister with all your heart, or my heavenly Father will not forgive you.”