Sayyidina Abu Huraira (RA) reported that some one asked Allah’s Messenger (SAW) about what most will cause people to enter Paradise. He said, “Fear of Allah and good manners.” And, he was asked about what will predominantly cause people to enter the Fire. He said, ‘The mouth and the sexual organ.”
[Ahmed 9107] Abdullah ibn Mubarak described good manners as a cheerful face, generous spending on good causes and removing harmful things.