1 Thessalonians 2:9

For you remember, brothers, our labor and weariness; that working night and day not to be burdensome to any one of you, we preached to you the gospel of God.

2 Thessalonians 3:8

neither did we eat bread of any one for nought, but worked with labor and fatigue, night and day, not to be burdensome to any 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, brothers, our labor and weariness; that working night and day not to be burdensome to any one of you, we preached to you the gospel of God.
2 Thessalonians 3:8
neither did we eat bread of any one for nought, but worked with labor and fatigue, night and day, not to be burdensome to any of you;