Strong G2756 κενός kenos · empty

1 Corinthians

1. 1 Corinthians 15:10
   But by the grace of God I am what I am: and his grace which was bestowed upon me was not in vain; but I laboured more abundantly than they all: yet not I, but the grace of God which was with me.
2. 1 Corinthians 15:14
   And if Christ be not risen, then is our preaching vain, and your faith is also vain.
3. 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.