Strong G2873 κόπος kopos · labor

1 Corinthians

1. 1 Corinthians 3:8
   Now he that planteth and he that watereth are one: and every man shall receive his own reward according to his own labour.
2. 1 Corinthians 15:58
   Therefore, my beloved brethren, be ye stedfast, unmoveable, always abounding in the work of the Lord, forasmuch as ye know that your labour is not in vain in the Lord.