Fiqh-us-Sunnah Volume 2, Supererogatory Prayer, Fiqh 2.095.

Section : Intentionally eating or drinking invalidates the salah.Ibn al-Munzhir says: "The people of knowledge agree that if one intentionally eats or drinks during a fard salah, he is to repeat the salah. The same is the case with nawafil according to the majority of scholars as what invalidates an obligatory (fard) prayer also invalidates … Continue reading Fiqh-us-Sunnah Volume 2, Supererogatory Prayer, Fiqh 2.095.

Fiqh-us-Sunnah Volume 2, Supererogatory Prayer, Fiqh 2.095A.

Section : Speaking intentionally about something unrelated to the salah invalidates the salah.Intentionally speaking during the salah, if it is not beneficial to the salah, invalidates the salah.Zaid ibn Arqam relates: "We used to talk while we were in salah and a person would speak to the person next to him until the verse was … Continue reading Fiqh-us-Sunnah Volume 2, Supererogatory Prayer, Fiqh 2.095A.

Fiqh-us-Sunnah Volume 2, Supererogatory Prayer, Fiqh 2.096.

Section : Intentionally making many motions.The scholars differ over what exactly constitutes a few motions and what constitutes many motions. Some say that one makes many motions when, if seen from behind, one would be certain that he was not performing salah, and anything less than that amount is considered only a few motions. Some … Continue reading Fiqh-us-Sunnah Volume 2, Supererogatory Prayer, Fiqh 2.096.

Fiqh-us-Sunnah Volume 2, Supererogatory Prayer, Fiqh 2.097.

Section : Intentionally leaving out an essential act or condition of the prayer without any valid excuse for doing so.Al-Bukhari and Muslim record that the Prophet sallallahu alehi wasallam told a bedouin who had not performed his salah well: "Return and pray for you have not prayed." (This hadith was mentioned earlier.)Ibn Rushd writes: "There … Continue reading Fiqh-us-Sunnah Volume 2, Supererogatory Prayer, Fiqh 2.097.

Fiqh-us-Sunnah Volume 2, Supererogatory Prayer, Fiqh 2.098.

Section : Smiling or laughing during the salah.Ibn al-Munzhir records that there is a consensus of opinion that laughing (during the salah) invalidates the prayer. An-Nawawi says: "This is the case if one laughs aloud, and produces sound. Most of the scholars say that there is no problem with smiling. If one is overcome by … Continue reading Fiqh-us-Sunnah Volume 2, Supererogatory Prayer, Fiqh 2.098.