When you accept cash, you are accepting a currency that can be deeply embedded with every form of evil. Most currencies contain not only demonic spirits, evil spirits and principalities, but also, the ether of hatred and disease.
Either you should exchange currency only with someone who is sealed and raptured, or you should not exchange currency. This means never using coins or paper currency. If you feel compelled to accept a cash gift, you should add it to a gift card immediately, and use the card as cash. Doing so will protect you from a host of evil practices.
The Lord God Almighty El Shaddai