The New Testament pattern and the pattern of the early Church seems to be that the Lord's messangers went out in teams of two. I can not find any one proof text to support this but if you look at the following verses a pattern emerges, Matthew 11:2, Matthew 18:16-20,Matthew 21:1, Mark 6:7, Mark 11:1, Mark 14:13, Luke 7:19, Luke 10:1-3, Luke 19:29, Luke 24:4, John 8:16-18, John 20:11-12, Acts 15:38-40