KJV : From thirty <07970> years <08141> old <01121> and upward <04605> until fifty <02572> years <08141> old <01121> shalt thou number <06485> (8799) them; all that enter in <0935> (8802) to perform <06633> (8800) the service <06635>, to do <05647> (8800) the work <05656> in the tabernacle <0168> of the congregation <04150>. {to perform...: Heb. to war the warfare}

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NASB : from thirty years and upward to fifty years old, you shall number them; all who enter to perform the service to do the work in the tent of meeting.

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NASB# : from thirty<7970> years<8141> and upward<4605> to fifty<2572> years<8141> old<1121>, you shall number<6485> them; all<3605> who enter<935> to perform<6633> the service<6635> to do<5647> the work<5656> in the tent<168> of meeting<4150>.