Isaiah 49:4
4 qBut I said, “I have labored in vain;
I have spent my strength for nothing and vanity;
yet surely my right is with the Lord,
and my recompense with my God.”
Isaiah 65:23
23 sThey shall not labor in vain
tor bear children for calamity,1
for uthey shall be the offspring of the blessed of the Lord,
and their descendants with them.