Psalm 127:1–2 makes one of the most direct statements about work's limits in Scripture: "Except the LORD build the house, they labour in vain that build it... It 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." The word "vain" — shav — means empty, nothing. Work done without God's building is not simply less effective — it is described as empty. The beloved receives sleep as a gift. The extra hours, the skipped rest, the bread of sorrows: these are not the currency God works in.
Matthew 6:33 gives the order directly: "But seek ye first the kingdom of God, and his righteousness; and all these things shall be added unto you." The structure of Matthew 6:25–33 is a long argument against the anxiety that drives overwork: the Father knows what you need, birds are fed without storing, flowers are clothed without labor. Workaholism is anxiety made systematic — the structural inability to trust that provision will come without relentless personal production.
Commentary is from a charismatic Protestant perspective, drawing on KJV text and public-domain sources including Spurgeon, Andrew Murray, and Matthew Henry.