Ecclesiastes 3:10

I have seen the task, which God has given to the sons of men to be occupied in it.

Genesis 3:19

In the sweat of your face shall you eat bread, till you return unto the ground; for out of it were you taken: for dust you are, and unto dust shall you return.

Ecclesiastes 2:26

For God gives to a man that is good in his sight wisdom, and knowledge, and joy: but to the sinner he gives the work of gathering and heaping up, only that he may give to him that is good before God. This also is vanity and grasping of the wind.

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 severe burden has God given to the sons of man to be afflicted with.

1 Thessalonians 2:9

For you remember, brethren, our labor and travail: for laboring night and day, because we would not be a burden unto any of you, we preached unto you the gospel of God.

2 Thessalonians 3:8

Neither did we eat any man's bread for nothing; but worked with labor and travail night and day, that we might not be a burden 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 severe burden has God given to the sons of man to be afflicted with.
Ecclesiastes 2:26
For God gives to a man that is good in his sight wisdom, and knowledge, and joy: but to the sinner he gives the work of gathering and heaping up, only that he may give to him that is good before God. This also is vanity and grasping of the wind.
Genesis 3:19
In the sweat of your face shall you eat bread, till you return unto the ground; for out of it were you taken: for dust you are, and unto dust shall you return.
1 Thessalonians 2:9
For you remember, brethren, our labor and travail: for laboring night and day, because we would not be a burden unto any of you, we preached unto you the gospel of God.
2 Thessalonians 3:8
Neither did we eat any man's bread for nothing; but worked with labor and travail night and day, that we might not be a burden to any of you: