In the New International Version
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Matthew 6:19-21
"Do not store up for yourselves treasures on earth, where moth and rust destroy, and where thieves break in and steal.
But store up for yourselves treasures in heaven, where moth and rust do not destroy, and where thieves do not break in and steal.
For where your treasure is, there your heart will be also."
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As near as I can tell, it says much the same thing in the NWT.
But I can understand the concern. What with 144,000 administrators headed heavenward to manage such things, and a so-called remnant to remain down here on what is billed as a paradise earth, after an increasing number of administrative delays...
Someday though, after those first prophetic hurdles have been overcome, you'll go out to your mailbox and you will be in for a surprise...