Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
Theft in a dream indicates adultery, usury (Riba), and lying. The thief is a cunning, deceitful man. Whoever sees himself stealing is falling into sin.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
Theft indicates worry and grief. Whoever has something stolen from him will be afflicted with worry.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
Theft is interpreted as betrayal. The thief is a treacherous man.