Be cautious for yourselves, lest you lose what you have accomplished, and so that, instead, you may receive a full reward
Other versions
King James Version
Look to yourselves, that we lose not those things which we have wrought, but that we receive a full reward. English Standard Version
Watch yourselves, so that you may not lose what we have worked for, but may win a full reward.New International Version
Watch out that you do not lose what you have worked for, but that you may be rewarded fully.