KJV : Only if thou carefully <08085> (8800) hearken <08085> (8799) unto the voice <06963> of the LORD <03068> thy God <0430>, to observe <08104> (8800) to do <06213> (8800) all these commandments <04687> which I command <06680> (8764) thee this day <03117>.

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NASB : if only you listen obediently to the voice of the LORD your God, to observe carefully all this commandment which I am commanding you today.

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NASB# : if<518> only<7534> you listen<8085> obediently<8085> to the voice<6963> of the LORD<3068> your God<430>, to observe<6213> carefully<6213> all<3605> this<2088> commandment<4687> which<834> I am commanding<6680> you today<3117>.