“Whenever you enter a town or village, find out who is worthy there and stay with them until you leave.”
Jesus gave what we call the Limited Commission. It announced the arrival of the Messiah and prepared the disciples for the Great Commission. Hospitality was common among the Jews. It was to become a missionary function in the church. The disciples were to judge who was worthy.
Associating with unworthy people gives the gospel a bad name. Christians must be concerned to preserve the name of Christ as worthy of honor.