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I am surprised no one has mentioned "entertaining angels unaware".
This is my belief, we as Christian's should give as we are moved by the Holy Spirit. It isn't our place to judge yeah or nah. But to listen and act as we are inspired to from a position of Love.
I try to give when I can because we have so many blessings that we should share to bless the less fortunate.Do not question their intentions. That's God's job.