1 Thessalonians 2:9

For ye remember, brethren, our labor and toil; for working night and day, that we might not be burthensome to any of you, we preached among you the gospel of God.

2 Thessalonians 3:8

neither did we eat any one's bread for nothing; but with labor and toil, working night and day, that we might not be burthensome 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 ye remember, brethren, our labor and toil; for working night and day, that we might not be burthensome to any of you, we preached among you the gospel of God.
2 Thessalonians 3:8
neither did we eat any one's bread for nothing; but with labor and toil, working night and day, that we might not be burthensome to any of you.