KJV : For <1063> he is <2076> (5748) the minister <1249> of God <2316> to thee <4671> for <1519> good <18>. But <1161> if <1437> thou do <4160> (5725) that which is evil <2556>, be afraid <5399> (5732) (5737); for <1063> he beareth <5409> (5719) not <3756> the sword <3162> in vain <1500>: for <1063> he is <2076> (5748) the minister <1249> of God <2316>, a revenger <1558> to [execute] wrath <3709> upon <1519> him that doeth <4238> (5723) evil <2556>.

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NASB : for it is a minister of God to you for good. But if you do what is evil, be afraid; for it does not bear the sword for nothing; for it is a minister of God, an avenger who brings wrath on the one who practices evil.

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NASB# : for it is a minister<1249> of God<2316> to you for good<18>. But if<1437> you do<4160> what<2556> is evil<2556>, be afraid<5399>; for it does not bear<5409> the sword<3162> for nothing<1500>; for it is a minister<1249> of God<2316>, an avenger<1558> who brings wrath<3709> on the one who practices<4238> evil<2556>.