'Ancients' in the Bible

Ye have heard that it was said to the ancients, Thou shalt not kill; but whosoever shall kill shall be subject to the judgment.

Again, ye have heard that it has been said to the ancients, Thou shalt not forswear thyself, but shalt render to the Lord what thou hast sworn.

Why do thy disciples transgress what has been delivered by the ancients? for they do not wash their hands when they eat bread.