This sect was present in the days of Jesus. Christians have traditionally seen Jesus as an opponent of the Pharisees, accusing them of being only outwardly religious, rather than inwardly observant of the Law. Jesus was opposed to the Pharisees emphasis on observance of religious purity laws. Some modern day scholars argue that this reading is no longer tenable, and that when the New Testament is read in its historical context, Jesus's attitude towards the law was more like a liberal or reform offshoot of Pharisee thought.
While during the first century CE and earlier, the Pharisees were faced with opposition from other Jewish groups such as the Essenes and the Sadducees, they were eventually triumphant; rabbinic Judaism as it is known today is descended from them.