Psalms 127:1-3
1Except the LORD build the house, they labour in vain that build it: except the LORD keep the city, the watchman waketh but in vain.
2It is vain for you to rise up early, to sit up late, to eat the bread of sorrows: for so he giveth his beloved sleep.
3Lo, children are an heritage of the LORD: and the fruit of the womb is his reward.
(KJV)