There are several things that are forbidden by Allah the most Exalted and we all shall practice this well. Here are few things shared by our Prophet (PBUH) that are forbidden to us: 

  1. To be undutiful to your mothers
  2. To bury your daughters alive
  3. To not to pay the rights of the others (e.g. charity, etc.)
  4. To beg of men (begging)

Read full hadith here:  Sahih Bukhari Volume 003, Book 041, Hadith Number 591.