Issue 579: If a person doubts over the number of the Rak'ats of a two-Rak'at or three-Rak'at prayer such as dawn prayer, travelers' prayer and sunset prayer, their prayer will be void.

Issue 580: In a four-Rak'at prayer, if a person doubts whether they have performed one Rak'at or more, their prayer will be void.

Issue 581: If before finishing the second prostration of a four-Rak'at prayer a person doubts whether they have offered two Rak'ats or more, their prayers will be void.

Issue 582: If a person doubts whether they have offered two Rak'ats or five, or if they doubt whether they have offered two Rak'ats or more than five Rak'ats, their prayer will be void.

Issue 583: If a person doubts whether they have offered three Rak'ats or six Rak'ats, or if they doubt whether they have offered three Rak'ats or more than six Rak'ats, their prayer will be void.

Issue 584: If a person does not know how many Rak'ats they have already offered, their prayers will be void.

Issue 585: If, while praying, a person has any one of the doubts which render prayers invalid, they are not allowed to break their prayer as soon as the doubt is aroused; Rather, they have to think for a while so as to remember what they have performed, and if they fail to remember that, they are allowed to break their prayers.