Malachi Chapter 3, Verse 14

14: Ye have said, It is vain to serve God: and what profit is it that we have kept his ordinance, and that we have walked mournfully before the LORD of hosts?- edit KJV text
14: And you have said: What have we spoken against thee? You have said: He laboureth in vain that serveth God, and what profit is it that we have kept his ordinances, and that we have walked sorrowful before the Lord of hosts?— edit Douay text
14: Ye said, He that serves God labours in vain: and what have we gained in that we have kept his ordinances, and in that we have walked as suppliants before the face of the Lord Almighty?— edit LXX text