Definition of Haram

Stealing 

Abu Huraira reported that the Messenger of Allah (Sall Allah-o-alaihe wa sallam) observed: The fornicator who fornicates is not a believer so long as he commits it and no thief who steals is a believer as long as he commits theft, and no drunkard who drinks wine is a believer as long as he drinks it.

‘Ibn Shahab said: “I was told by Abdul Malik b. Abi Bakr b. Abdur Rahman; that Abu Bakr so narrates from Abu Huraira who said adding: No plunderer who plunders a valuable thing that attracts the attention of people is a believer so long as he commits this act.”

Bribery 

Abdullah b. ‘Amr reported: Allah’s Messenger (Sall Allah-o-alaihe wa sallam) cursed the one who offers bribe as well as one who accepts it.

Abu Umamah reported that the Holy Prophet (Sall Allah-o-alaihe wa sallam) said: “He who makes for his brother a recommendation and then (the latter) offers him a gift for it and he accepts that, enters into a big gate of riba” (i.e. he commits an act involving riba).

Source: Economic Teachings of Prophet Muhammad (peace be upon him): A Select Anthology of Hadith Literature on Economics, Muhammad Akram Khan. Republished with permission.