Efesus 6:13

6:13 For this reason, take up the full armor of God so that you may be able to stand your ground ¹  on the evil day, and having done everything, to stand.

Efesus 6:17

6:17 And take the helmet of salvation ²  and the sword ³  of the Spirit, which is the word of God.

[6:13]  ¹ tn The term ἀνθίστημι (anqisthmi) carries the idea of resisting or opposing something or someone (BDAG 80 s.v.). In Eph 6:13, when used in combination with στῆναι (sthnai; cf. also στῆτε [sthte] in v. 14) and in a context of battle imagery, it seems to have the idea of resisting, standing firm, and being able to stand your ground.

[6:17]  ² sn An allusion to Isa 59:17.

[6:17]  ³ sn The Greek term translated sword (μάχαιρα, macaira) refers to the Roman gladius, a short sword about 2 ft (60 cm) long, used for close hand-to-hand combat. This is the only clearly offensive weapon in the list of armor mentioned by the author (he does not, for example, mention the lance [Latin pilum]).