KJV : But shall minister <08334> (8765) with their brethren <0251> in the tabernacle <0168> of the congregation <04150>, to keep <08104> (8800) the charge <04931>, and shall do <05647> (8799) no service <05656>. Thus shalt thou do <06213> (8799) unto the Levites <03881> touching their charge <04931>.

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NASB : "They may, however, assist their brothers in the tent of meeting, to keep an obligation, but they \i1 themselves\i0 shall do no work. Thus you shall deal with the Levites concerning their obligations."

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NASB# : "They may, however, assist<8334> their brothers<251> in the tent<168> of meeting<4150>, to keep<8104> an obligation<4931>, but they <I>themselves</I> shall do<5647> no<3808> work<5656>. Thus<3602> you shall deal<6213> with the Levites<3881> concerning their obligations<4931>."