And Pharaoh commanded the same day the taskmasters of the people, and their officers, saying,(Exodus 5:6)

Ye shall no more give the people straw to make brick, as heretofore: let them go and gather straw for themselves.(Exodus 5:7)

And the tale of the bricks, which they did make heretofore, ye shall lay upon them; ye shall not diminish ought thereof: for they be idle; therefore they cry, saying, Let us go and sacrifice to our God.(Exodus 5:8)

Let there more work be laid upon the men, that they may labor therein; and let them not regard vain words.

And the taskmasters of the people went out, and their officers, and they spake to the people, saying, Thus saith Pharaoh, I will not give you straw.(Exodus 5:10)

Go ye, get you straw where ye can find it: yet not ought of your work shall be diminished.(Exodus 5:11)

So the people were scattered abroad throughout all the land of Egypt to gather stubble instead of straw.(Exodus 5:12)

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Exodus 5:9 - Cross Reference

Shall vain words have an end? or what emboldeneth thee that thou answerest? (Job 16:3)

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? (Malachi 3:14)

But my words and my statutes, which I commanded my servants the prophets, did they not take hold of your fathers? and they returned and said, Like as the LORD of hosts thought to do unto us, according to our ways, and according to our doings, so hath he dealt with us. (Zechariah 1:6)

Let no man deceive you with vain words: for because of these things cometh the wrath of God upon the children of disobedience. (Ephesians 5:6)

Then spake Azariah the son of Hoshaiah, and Johanan the son of Kareah, and all the proud men, saying unto Jeremiah, Thou speakest falsely: the LORD our God hath not sent thee to say, Go not into Egypt to sojourn there: (Jeremiah 43:2)

Thou sayest, (but they are but vain words,) I have counsel and strength for the war. Now on whom dost thou trust, that thou rebellest against me? (2 Kings 18:20)