Ecclesiastes 3:10

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

Genesis 3:19

In the sweat of thy face shalt thou eat bread, till thou shalt return to the ground; for out of it wast thou taken: for dust thou art, and to dust shalt thou return.

Ecclesiastes 2:26

For God giveth to a man who is good in his sight, wisdom, and knowledge, and joy: but to the sinner he giveth toil, to gather, and to amass, that he may give to him that is good before God. This also is vanity and vexation of spirit.

Ecclesiastes 1:13-14

And I gave my heart to seek and search out by wisdom concerning all things that are done under heaven: this grievous labor hath God given to the sons of man to be exercised with it.

1 Thessalonians 2:9

For ye remember, brethren, our labor and toil: for laboring night and day, because we would not be chargeable to any of you, we preached to you the gospel of God.

2 Thessalonians 3:8

Neither did we eat any man's bread for naught; but wrought with labor and toil night and day, that we might not be chargeable 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

Ecclesiastes 1:13
And I gave my heart to seek and search out by wisdom concerning all things that are done under heaven: this grievous labor hath God given to the sons of man to be exercised with it.
Ecclesiastes 2:26
For God giveth to a man who is good in his sight, wisdom, and knowledge, and joy: but to the sinner he giveth toil, to gather, and to amass, that he may give to him that is good before God. This also is vanity and vexation of spirit.
Genesis 3:19
In the sweat of thy face shalt thou eat bread, till thou shalt return to the ground; for out of it wast thou taken: for dust thou art, and to dust shalt thou return.
1 Thessalonians 2:9
For ye remember, brethren, our labor and toil: for laboring night and day, because we would not be chargeable to any of you, we preached to you the gospel of God.
2 Thessalonians 3:8
Neither did we eat any man's bread for naught; but wrought with labor and toil night and day, that we might not be chargeable to any of you: