Learn the complete list of things that invalidate Salah according to the Qur’an, Sunnah, and the understanding of the Salaf.
Praise be to Allah, and blessings and peace be upon the Messenger of Allah, his family, and his companions.
The things that invalidate the prayer (Mubtilat as-Salah) are well known among the scholars, although there are some differences regarding their exact number and certain details. In general, these are actions or occurrences that contradict the conditions, pillars, obligations, or proper manner of Salah.
A Muslim should learn these invalidators so that he may preserve his prayer and perform it in the manner prescribed by Allah and His Messenger Muhammad ﷺ.
One of the conditions for the validity of prayer is purification. Therefore, anything that invalidates Wudu also invalidates the prayer.
The Messenger of Allah Muhammad ﷺ said:
Examples include passing wind, urinating, defecating, and other matters that invalidate purification. According to the stronger opinion, eating camel meat also invalidates Wudu.
Covering the ‘Awrah is one of the conditions of prayer.
Allah says:
If a person deliberately uncovers his ‘Awrah during prayer, his prayer becomes invalid. However, if it is uncovered unintentionally and he covers it immediately, then the prayer remains valid according to the majority of scholars.
Facing the Qiblah is a condition of prayer.
Allah says:
If a person deliberately turns away from the Qiblah to a significant extent without a valid excuse, his prayer becomes invalid.
The body, clothing, and place of prayer must be free from impurity.
If a person knowingly prays while carrying impurity and does not remove it, his prayer is invalid. However, if he discovers the impurity during prayer and removes it immediately, his prayer remains valid.
Likewise, if he only learns of the impurity after completing the prayer, his prayer is valid according to the stronger scholarly view.
Excessive movement that is continuous and unnecessary invalidates the prayer because it contradicts the nature of Salah.
Minor movements, occasional adjustments, carrying a child, or actions done out of necessity do not invalidate the prayer.
The pillars (Arkan) of prayer are essential acts without which the prayer cannot be valid.
Examples include:
If any pillar is omitted deliberately, the prayer becomes invalid.
If a person intentionally adds an extra bowing, prostration, or another pillar to the prayer, his prayer becomes invalid because he has deliberately altered the prescribed form of worship.
The pillars of prayer must be performed in their prescribed sequence.
For example, if a person deliberately prostrates before bowing, his prayer becomes invalid because he has intentionally changed the order established by the Sunnah.
If a person intentionally ends the prayer by saying the Salam before completing all of its required units, the prayer becomes invalid.
However, if it occurs out of forgetfulness, then the prayer may be completed and corrected with Sujud as-Sahw.
If a person deliberately changes the words of the Qur'an in a manner that alters the meaning, particularly in Surah Al-Fatihah, this invalidates the prayer.
As for unintentional mistakes, the ruling depends on the nature and severity of the mistake.
The prayer contains obligatory acts (Wajibat) that must be performed.
Examples include:
If these are deliberately omitted, the prayer becomes invalid.
If omitted forgetfully, the prayer remains valid but should be completed with Sujud as-Sahw.
If a person decides in his heart to stop praying, even if he remains physically standing, his prayer becomes invalid because acts of worship are dependent upon intention.
The scholars are agreed that laughing audibly during prayer invalidates the prayer.
As for merely smiling without sound, it does not invalidate the prayer, although it detracts from humility and concentration.
Mu‘awiyah ibn Al-Hakam As-Sulami (رضي الله عنه) narrated that the Prophet Muhammad ﷺ said:
Deliberate speech unrelated to the prayer invalidates Salah.
If a person speaks due to forgetfulness or ignorance of the ruling, then according to the stronger opinion his prayer remains valid.
If a person deliberately eats or drinks while praying, his prayer becomes invalid according to scholarly consensus because this action clearly contradicts the nature of Salah.
As for accidental swallowing or matters beyond one's control, these do not carry the same ruling.
Sheikh Ibn Baz (رحمه الله) included among the invalidators of prayer: losing purification, excessive movement, deliberate speech, laughing, eating, drinking, and neglecting the pillars and obligations of Salah.
Imam Mar‘i ibn Yusuf Al-Hanbali (رحمه الله) likewise mentioned these matters among the recognized nullifiers of prayer in his book Dalil At-Talib li Nayl Al-Matalib.
The scholars emphasized that a Muslim should learn the rulings of prayer thoroughly because Salah is the greatest practical pillar of Islam after the testimony of faith.
A Muslim should strive to protect his prayer from anything that may invalidate it and should learn the rulings of Salah so that his worship is performed correctly in accordance with the Qur'an, the authentic Sunnah, and the understanding of the righteous predecessors.
And Allah the Exalted knows best.