The Pharisees were members of a strict sect of Judaism, a group whom Christ repeatedly criticized during His ministry. (See Matthew 3; Matthew 23; Mark 8; Luke 11.) They criticized Christ for eating with sinners, for plucking grain on the Sabbath, for failing to wash His hands before eating, for eating with tax collectors and other sinners, for claiming He could forgive sins, and for healing a man on the Sabbath. Eventually they conspired with the Jewish chief priests as well as the Roman civil authorities to have Christ crucified.
The term "pharisee" nowadays refers to anyone who is overly pious and hypercritical of others, holding those around him to a higher standard than himself.