Seeing a beggar in your dream symbolizes the seeker of knowledge. If you give something to the beggar in your dream, it indicates that you will achieve success on your path to acquiring knowledge. The beggar's humility and surrender suggest that you are ready to learn something new in your life. This represents an opportunity for you to overcome your limitations and gain new experiences.
From Imam Muhammad Ibn Seerin's Dictionary of Dreams According to Islamic Inner Traditions â entry "Beggar" (page 37).
In a dream, a beggar represents a seeker of knowledge. If he is given what he is begging for in a dream. it means that he will succeed in his pursuit of knowledge. His humbleness and his submission when asking means victory. Beggars in a dream also imply sorrow, worries, distress, or contemplation. If one sees a beggar receiving or taking something from him in a dream, it means being in dire need for something, or he could represent the death of the person intended in the dream. If one sees beggars entering his house or his town in a group in a dream, it means dispersal of his family or household and if they take something from his house, it means a catastrophe. A beggar in a dream also represents a student, and the giver represents the teacher or shaikh. If one sees himself begging, but to no avail in a dream, it means that he will be humiliated. (Also see Hobo; Poverty)
Note: Islamic dream interpretation depends on the dreamer's circumstances and state. This is a general guide drawn directly from the source book.