Source: The Great Interpretation of Dreams (Ibn Sirin)
The kidneys in a dream are the two ministers or the closest relatives. Their soundness indicates their righteousness and strength.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
The kidneys indicate wealth and richness. Whoever sees himself eating them will gain wealth.
Source: Signs in the Science of Expressions (Ibn Shaheen)
The kidneys are interpreted as wealth. Whoever sees pain in them will suffer a decrease in his wealth.