זה יתנו כל העובר על הפקודים מחצית השקל…(כי תשא ל:יג)

In his commentary on the Torah, Rashi describes how Moshe Rabbeinu could not picture half a Shekel until Hashem showed him a fiery coin “מטבע של אש”, which was taken from beneath the Heavenly throne.

The message: When one uses his money to give tzedakah (charity), it should be presented with a warm heart – fired with the warmth of the Mitzva. Conversely, if one fails to put one’s money to help a good cause, there’s the risk that the money can burn like fire and destroy everything in its path.