Connecting giving and treasure

Jesus unmistakably connects giving with providing treasure...

“Sell your possessions (show compassion) and give [donations] to the poor. Provide money belts for yourselves that do not wear out, an unfailing and inexhaustible treasure in the heavens, where no thief comes near and no moth destroys. - Luke 12:33

 Hence, eternal rewards are not only rewards we will receive in eternity, but rewards that are themselves eternal, imperishable, inexhaustible.

Moses prayed the oldest psalm -

And let the [gracious] favor of the Lord our God be on us;Confirm for us the work of our hands—Yes, confirm the work of our hands. - Psalm 90:17

The literal translation is "make permanent the work of our hands."

Why do you believe the word 'treasure' in Matthew 6 refers specifically to money and possessions?