Luke 10:4

The mission of the Seventy would be relatively brief, so they needed to travel lightly (cf. Luke 9:3; Mark 6:8). The implication of their not carrying a purse was that they should depend on the hospitality and gifts of believers to sustain them, but most importantly on God. In ancient Near Eastern culture people often gave very long greetings that tied them up sometimes for days (cf. Judges 19:4-9; 2 Kings 4:29). Jesus did not mean that His disciples should be unfriendly or unsociable but that they should not allow these greetings to divert them from their mission. They were to pursue their work and not waste their time on lesser things.