OT-PROPHET-MINOR.filter - kjv vain:

kjv@Zechariah:10:2 @ For the idols have spoken vanity, and the diviners have seen a lie, and have told false dreams; they comfort in vain: therefore they went their way as a flock, they were troubled, because there was no shepherd.

kjv@Malachi:3:14 @ 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?