Numbers 18:26

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        26.  Moreover thou shalt speak unto the Levites, and say unto them, When ye take of the 
        children of Israel the tithe which I have given you from them for your inheritance, then 
        ye shall offer up a heave-offering of it for Jehovah,
      
      
        <b> a tithe of the tithe. </b>
      
    </p>