Invalidators of Prayer

Prayer is invalidated by:

1. Uttering even two letters or one meaningful letter unless one forgets and it is little;

2. Performing many moves, which according to some scholars are as many as what would last for the duration of one rak^ah. According to other scholars three consecutive moves invalidate the prayer. The first saying, however, has a stronger evidence;

3. Performing an excessive move;

4. Adding an extra integral which involves action;

5. Performing one move with the purpose of playing;

6. Eating and drinking except if one forgets and it is little;

7. Intending to interrupt prayer;

8. Making an intention to interrupt prayer contingent on the occurrence of an incident;

9. Hesitating about interrupting prayer;

10. The completion of an integral while the doubt about one's intention of the opening saying of Allahu akbar (taharrum) is still persisting or doubting for a long time about this intention.