- Presence of water before prayer
Dry ablution is invalidated by the presence of water before the prayer, and this is by agreement of the four schools of jurisprudence. 

- Presence of water during prayer:
Scholars have differed over the course of action for the one who gains access to water during the prayer, and this is according to two views:
The first: It is that the person praying should leave their prayer and perform ablution if they are in a state of minor hadath or wash themselves if they are in a state of major hadath. This is the position of the Hanafis, Hanbalis, and a group from the Salaf. It is also the choice of al-Muzani and Ibn Surayj from the Shafi`is, Ibn Hazm al-Zahiri, Ibn Rushd the grandson from the Malikis, and Ibn `Uthaymin.
The second: It is that they should conclude their prayer. This is the position of the Malikis, Shafi`is, [228] Shafi`is excepted from this the dry ablution from which a repetition of the prayer will also take place. For example, if someone performs dry ablution in the city, then it is wajib for them to break their prayer, as if they do not break it, they will have to repeat it. This is their principle when it comes to this type of dry ablution. a narration from Ahmad, and the position of Abu Thawr and Dawud al-Zahiri. It is also the choice of Ibn al-Mundhir and al-Tabari. 

- The presence of water after prayer but before the end of the time of prayer:
Whoever gains access to water after prayer but before the end of the time of prayer [229] Ibn `Abd al-Bar said: “The majority of jurists are in agreement that whoever seeks out water but does not find it, so performs dry ablution and prays, then finds it after completing his prayer – and he truly sought it out prior to prayer and not simply forgot it – then his prayer is done. Some viewed it as mustahabb to repeat it after performing ablution or wash if it is still within the time.” Al-Istidhkar (314/1), al-Tamhid (291/19) then it is sufficient for him and he does not need to repeat it. This is by agreement of the four schools of jurisprudence, as well as the choice of Ibn Hazm al-Zahiri. 

- The presence of water after prayer and after the end of the time of prayer:
Whoever performs dry ablution and prays but then gains access to water after the end of the time of prayer does not need to repeat their prayer. Consensus has been quoted over this by Ibn al-Mundhir, al-Baghawi, al-Kasani, Ibn Qudamah, Ibn Rajab, and Ibn Taymiyyah.

Thirdly: Ability to use water
Dry ablution is invalidated through the ability to use water. Consensus has been quoted over this by: Shams al-Deen Ibn Qudamah and Ibn Taymiyyah.

Fourthly: End of the prayer time
Dry ablution is not invalidated by the ending of the time of prayer. This is the position of the Hanafis, Zahiris, and the choice of Ibn Taymiyyah, al-Shawkani, Ibn Baz, and Ibn `Uthaymin.