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

Rashi says that Hashem showed Moshe Rabbeinu a coin of fire.

Why didn’t Hashem show the vision of all the vessels of the Mishkan? It could be that Moshe wondered how a coin can forgive all sins, thus Hashem showed him a “מטבע של אש” – a coin made out of fire, to show that if Yidden want to give tzedakah, a fire ignites in his heart which the Yetzer Hara tries to avoid. Still, a Yid can overcome and give nachas to Hashem and will forgive all his sins.