1 Thessalonians 2:9

For you remember, brethren, our labor and toil; for, laboring night and day, that we might not be burdensome to any one of you, we preached to you the gospel of God.

2 Thessalonians 3:8

nor did we eat any one's bread for nothing: but worked with labor and toil, night and day, that we might not burden any one of you;

Treasury of Scripture Knowledge

Summary

I have seen the travail, which God hath given to the sons of men to be exercised in it.

Bible References

General references

1 Thessalonians 2:9
For you remember, brethren, our labor and toil; for, laboring night and day, that we might not be burdensome to any one of you, we preached to you the gospel of God.
2 Thessalonians 3:8
nor did we eat any one's bread for nothing: but worked with labor and toil, night and day, that we might not burden any one of you;