One of the great conundrums in the Synoptics is the issue of whether Jesus told his disciples to take a staff, not take a staff, or don't take an extra staff. I don't have a complete answer, but in my reading part of the answer occurred to me and it illustrates the need for common sense in exegesis.
In Mark 6:8–9 Jesus says, "Take nothing for the journey except a staff (εἰ μὴ ῥάβδον μόνον)—no bread, no bag, no money in your belts. Wear sandals but not an extra shirt (ὑποδεδεμένους σανδάλια, καὶ μὴ ἐνδύσησθε δύο χιτῶνας)."
In Luke 9:3 he told them, “Take nothing for the journey—no staff, no bag, no bread, no money, no extra shirt (Μηδὲν αἴρετε εἰς τὴν ὁδόν, μήτε ῥάβδον μήτε πήραν μήτε ἄρτον μήτε ἀργύριον μήτε [ἀνὰ] δύο χιτῶνας ἔχειν)."