Dreaming of manna signifies that you will gain legitimate wealth without much effort. This is a pleasant feeling, indicating that positive changes are on the horizon in your life. Seeing manna in your dream suggests that as a result of your hard work, something good is coming your way, which will bring you joy. This dream symbolizes a time of ease and happiness in your life.
From Imam Muhammad Ibn Seerin's Dictionary of Dreams According to Islamic Inner Traditions â entry "Manna" (page 264).
A gummy saccharine secretion found on a species of a Tamarisk tree. A manna tree is also found in the Egyptian Sinai. Eating manna in a dream means receiving lawful money without any labor or hardships, or it could mean a favor and a bestowal by the grace of God Almighty. Seeing manna in a dream also means spending money on God's path, or escaping from a fatal accident or danger. Exchanging manna for green sprouts and garlic in a dream means humiliation and poverty. Eating manna in a dream means earnings lawful money.
Note: Islamic dream interpretation depends on the dreamer's circumstances and state. This is a general guide drawn directly from the source book.