KJV : Look <991> (5720) to yourselves <1438>, that <3363> (0) we lose <622> (5661) not <3363> those things which <3739> we have wrought <2038> (5662), but <235> that we receive <618> (5632) a full <4134> reward <3408>. {wrought: or, gained, some copies read, ye have gained, but that ye, etc.}

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NASB : Watch yourselves, that you do not lose what we have accomplished, but that you may receive a full reward.

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NASB# : Watch<991> yourselves<1438>, that you do not lose<622> what<3739> we have accomplished<2038>, but that you may receive<618> a full<4134> reward<3408>.