A man came to my house in his car with his daughter, who he said had undergone surgery. He asked me for money for gas because he lives in a distant province and had spent his money on medicine. I felt tense and didn't know what to do in such situations. I called my father, and he refused to give him anything because he suspected it was begging and thought he was lying, saying he had seen such cases before. However, now I feel guilty for not helping him, even a little. Is it forbidden for me not to help him? What should I do?