For God is not unjust. He will not forget your work and the love you have shown for His name as you have ministered to the saints and continue to do so.
KJV
For God [is] not unrighteous to forget your work and labour of love, which ye have shewed toward his name, in that ye have ministered to the saints, and do minister.
ASV
for God is not unrighteous to forget your work and the love which ye showed toward his name, in that ye ministered unto the saints, and still do minister.