the one with a purse should take it, and likewise a bag: The apostles had traveled without supplies and relied on the support of other people for their missions to Israel's villages (9:3; 10:3–4). In the dangerous days to come, they would have to plan more carefully. Jesus prepared his disciples for his suffering and death, and also for the establishing of the church and the worldwide proclamation of the good news.
a sword: Jesus was probably not telling his followers to use weapons or fight. Instead, he was speaking figuratively, warning them to prepare for a time of violent conflict and suffering.