Is It Proper For A Church To Ask A Member The Source Of His Tithe?

A church member is jobless or has no verifiable source of income. But he pays in a hefty sum of amount into the church as his tithe (10 percent of income ).

Should a church ask him the source of money or just regard it as God's blessings?

source http://www.nairaland.com/6029148/it-proper-church-ask-member