A quarrel broke out between Salman al-Farsi and a man who addressed to him: “Who are you and what are you?" Salman answered: “The first of you and me is a dirty sperm. The last of you and me is a stinking carrion. On the Day of Resurrection, the scales will be maintained. Those whose good deeds will weigh heavier on the scale will be the true noble men, but those whose good deeds will be lighter on the scale, will be the true inglorious." Bihar ul-Anwar; vol. 15 part 3 page 124 )

Reference :The Ahl Ul-Bayt Ethical Role-Models