The following are matters that nullify your Salah (Islamic prayer) while performing:
- Intentionally leaving a rukun (pillar) or un-intentionally leaving
- A rukun without returning and making up that pillar.
- Intentionally leaving a wajib (obligation).
- Intentionally leaving a condition of salaah.
- Loss of Tahaarah
- Intentionally talking or laughing
- Intentionally eating or drinking
- Excessive movements which are not part of salaah.