Cross reference
Ecclesiastes 3:10
10 I have seen the travail which God hath given to the sons of men to be exercised therewith.
Genesis 3:19
19 in the sweat of thy face shalt thou eat bread, till thou return unto the ground; for out of it wast thou taken: for dust thou art, and unto dust shalt thou return.
Ecclesiastes 1:13-14
13 And I applied my heart to seek and to search out by wisdom concerning all that is done under heaven: it is a sore travail that God hath given to the sons of men to be exercised therewith.
14 I have seen all the works that are done under the sun; and, behold, all is vanity and a striving after wind.
Ecclesiastes 2:26
26 For to the man that pleaseth him `God' giveth wisdom, and knowledge, and joy; but to the sinner he giveth travail, to gather and to heap up, that he may give to him that pleaseth God. This also is vanity and a striving after wind.
1 Thessalonians 2:9
9 For ye remember, brethren, our labor and travail: working night and day, that we might not burden any of you, we preached unto you the gospel of God.
2 Thessalonians 3:8
8 neither did we eat bread for nought at any man's hand, but in labor and travail, working night and day, that we might not burden any of you: