Invocations :

Invocation against the distractions of Satan during the prayer and recitation of the Qur'an

138. 'A'oothu billaahi minash-Shaytaanir-rajeem.

(Say:) I seek refuge in Allah from Satan the outcast (then spit to your left). (Do this three times reciting in Arabic.)

Reference: Muslim 4/1729.

Invocation for when you find something becoming difficult for you

Allaahumma laa sahla 'illaa maal ja'altahu sahlan wa 'Anta taj'alul-hazna 'ithaa shi'ta sahlan.

139. O Allah, there is no ease other than what You make easy. If You please You ease sorrow.

Reference:

Ibn Hibban in his Sahih (no. 2427), and Ibn As- Sunni (no. 351). Al-Hafidh (Ibn Hajar) said that this Hadith is authentic. It was also declared authentic by 'Abdul-Qadir Al-Arna'ut in his checking of An-Nawawi's Kitabul-Athkarp. p106.

What to say and do if you commit a sin

140. There is not any slave of Allah who commits a sin, then he perfects his ablution and stands to pray two Rak'ahs of prayer, then seeks Allah's forgiveness, except that Allah will forgive him.

Reference:

Abu Dawud 2/86, At-Tirmithi 2/257. Al-Albani graded it authentic in Sahih Abu Dawud 1/283.

Invocations against the Devil and his promptings

141. Seeking refuge with Allah against him (i.e. by saying I seek refuge in Allah from Satan the outcast).

Reference: Abu Dawud 1/206, At-Tirmithi. See also Al-Albani, Sahih At-Tirmithi 1/77, and Surat Al-Mu'minun, 23:98-9.

142. The call to prayer - 'Athan.

Reference: Muslim 1/291, Al-Bukhari 1/151.

143. Saying words of Allah's remembrance (Thikr) and recitation of the Qur'an.

Reference: "Do not turn your homes into graveyards, surely the Devil flees from the house in which Surat Al-Baqarah is read," Muslim 1/539. The Devil is also driven out by the invocations for morning and evening, those that are said before sleeping and upon waking up, those for entering and leaving the house, including those for entering and leaving the mosque, and by many other authentic invocations taught to us by the Prophet (SAW) such as the reading of 'Ayatul-Kursi, (Al-Baqarah 2:255), and the last two 'Ayat of Surat Al-Baqarah before going to sleep. Whoever says: "There is none worthy of worship but Allah alone, Who has no partner, His is the dominion and His is the praise, and he is Able to do all things," one hundred times, it will be a protection for him from the Devil throughout the day.'

Invocation for when something you dislike happens, or for when you fail to achieve what you attempt to do

144. Qadarullaahi wa maa shaa'afa'ala.

It is the Decree of Allah and He does whatever He wills.

Reference:

"The strong believer is better and more dear to Allah than the weak believer, and in each of them there is good. Be vigilant for what is to your benefit and seek the help of Allah and do not falter. But when you are striken by some setback, do not say: 'If only I had done such and such,' rather say: 'It is the Decree of Allah and He does whatever He wills.' For verily the saying 'if (i.e. if only I had) begins the work of the Devil." Muslim 4/2052.