Exegesis:

eipen de autois, Alla nun ‘then he said to them, “But now…” .’ The introductory clause serves to emphasize the contrast between then and now to which alla nun refers.

ho echōn ballantion aratō ‘he who has a purse must take it along.’

homoiōs kai pēran ‘in the same way also a knapsack,’ short for homoiōs kai ho echōn pēran aratō ‘and in the same way he who has a knapsack must take it along.’

kai ho mē echōn ‘and he who has not…’ with either ballantion ‘purse,’ i.e. ‘money,’ or, machairan ‘sword’ understood. The latter is preferable.

pōlēsatō to himation autou kai agorasatō machairan ‘must sell his cloak and buy a sword.’ For himation cf. on 6.29.

Translation:

Let him who has … take, or, ‘if a man has … he must take,’ “if you have … take” (The Four Gospels – a New Translation).

Sword may be described as, ‘huge knife,’ ‘large knife of war.’

Mantle, see on “cloak” in 6.29.

Quoted with permission from Reiling, J. and Swellengrebel, J.L. A Handbook on the Gospel of Luke. (UBS Handbook Series). New York: UBS, 1971. For this and other handbooks for translators see here . Make sure to also consult the Handbook on the Gospel of Mark for parallel or similar verses.