What is newton's third law of rocketry?

While rockets were initially being invented in the early 13th century, and Newton was born in the mid 16th Century, Newton has not contributed to this field of knowledge. However, if you meant to ask about his 3rd law of motion, it states:
For every action there is an equal and opposite reaction. This means that any force exerted onto an object has a counterpart force that is exerted in the opposite direction back onto the first object. A common example is of two ice skaters pushing against each other and sliding apart in opposite directions. This