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Well here ya go...
From the mormon Spring General Conference, 2005..
"Among those who do not sacrifice there are two extremes: one is the rich, gluttonous man who won't and the other is the poor, destitute man who believes he can't. But how can you ask someone who is starving to eat less? Is there a level of poverty so low that sacrifice should not be expected or a family so destitute that paying tithing should cease to be required?
One reason the Lord illustrates doctrines with the most extreme circumstances is to eliminate excuses. If the Lord expects even the poorest widow to pay her mite, where does that leave all others who find that it is not convenient or easy to sacrifice?
No bishop, no missionary should ever hesitate or lack the faith to teach the law of tithing to the poor. The sentiment of "They can't afford to" needs to be replaced with "They can't afford not to."
One of the first things a bishop must do to help the needy is ask them to pay their tithing. Like the widow,
if a destitute family is faced with the decision of paying their tithing or eating, they should pay their tithing." (Elder Lynn Robbins, Mormon Leader)