Matthew 6:19
Do not store up for yourselves treasures on earth, where moth and rust destroy, and where thieves break in and steal.
What it says
Earthly treasure is exposed to decay and theft, so it cannot remain secure.
What it is doing
It warns against storing value where loss is built in.
In context
19Do not store up for yourselves treasures on earth, where moth and rust destroy, and where thieves break in and steal. 20But store up for yourselves treasures in heaven, where moth and rust do not destroy, and where thieves do not break in and steal. 21For where your treasure is, there your heart will be also.