Source: The Great Interpretation of Dreams (Ibn Sirin)
Praying in an impure place indicates corruption in religion and committing abominations.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
Praying in an impure place indicates worry and grief or unlawful money.
Source: Signs in the Science of Expressions (Ibn Shaheen)
Praying in an impure place is interpreted as worry and corruption.