Jehovah's Witnesses believe they must preach the good news door to door and house to house. They believe this method of preaching is God's will. However this is not the way Jesus and his disciples spread their message.
Jesus and his disciples did not preach house to house. The Bible says, 'the high priest questioned Jesus about his disciples and his teaching. "I have spoken openly to the world," Jesus replied. "I always taught in synagogues or at the temple, where all the Jews come together. I said nothing in secret.' John 18:19,20
Jesus said, 'Stay in that house, eating and drinking whatever they give you, for the worker deserves his wages. Do not move around from house to house.' Luke 10:7
Jesus spoke to his disciples in private but his primary way of finding disciples was in public places where groups of Jews typically met. Mark 1:21-28; Mark 1:35-39; Mark 6:1-6; Mark 14:49; Luke 4:42-44; Luke 13:10-17; Luke 19:47,48; Luke 21:37,38; John 7:14-53; 8:1-30; John 18:19, 20
'Day after day, in the temple courts and from house to house, they never stopped teaching and proclaiming the good news that Jesus is the Christ.' Acts 5:42
'You know that I have not hesitated to preach anything that would be helpful to you but have taught you publicly and from house to house.' Acts 20:20
Jesus warned his disciples about the leaven of the Pharisees. Immediately after Jesus died, the leaven of the Pharisees began to contaminate the early Christian congregation. The teachings of Jesus were simple, perfect and true. However due to the influence of the Pharisees, additional rules, regulations, doctrines, and self righteousness, made the early Christians 'rise above' the true teachings of Christ. For example, get the Facts About The Apostle Paul.