Strong's 1980 Occurrences

KJV: 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?
NASB: "You have said, 'It is vain to serve God; and what profit is it that we have kept His charge, and that we have walked in mourning before the LORD of hosts?