Alī b. Abī Tālib (raḍiy Allāhu ‘anhu) narrated that the Messenger of Allah ﷺ said: “The screen between the jinn and the nakedness of the children of Ādam when they enter the lavatory is to say: ‘In the Name of Allah.’” (Tirmidhī 606)
Anas b. Mālik (raḍiy Allāhu ‘anhu) narrated that whenever the Prophet ﷺ went to answer the call of nature, he used to say: “O Allah, I seek Your protection from the male and female devils.” (Bukhārī 142, Muslim 375)
Zayd b. Arqam (raḍiy Allāhu ‘anhu) narrated that the Messenger of Allah ﷺ said: “These waste areas are visited (by jinns), so when anyone of you enters, let him say: ‘O Allah, I seek Your protection from the male and female devils.’” (Abū Dāwūd 6, Ibn Ḥibbān 1408, Ibn Mājah 296)
The Messenger of Allah ﷺ said: “There is no Ṣalāh for a person who does not perform wudhū, and there is no wudhū for a person who does not mention the name of Allah (in the beginning).” (Abū Dāwūd 101, Ibn Mājah 399)
Anas b. Mālik (raḍiy Allāhu ‘anhu) narrated: “Whenever the Messenger of Allah ﷺ performed ablution, he took a handful of water, and, putting it under his chin, made it go through his beard, saying: [the above].” (Abū Dāwūd 145, Bayhaqī 250)
I bear witness that there is no god but Allah. He is Alone and He has no partner whatsoever. And I bear witness that Muhammad ﷺ is His slave and His Messenger. O Allah, make me amongst the repentant, and make me amongst those who purify themselves.
The Messenger of Allah ﷺ said: “Whosoever does wudhū and says [the above], it will be recorded in a parchment and then sealed with a seal which will not be broken till the Day of Judgement.” (Nasā’ī in ʿAmal al-Yawm wa-l-Laylah 81, al-Ṭabarānī in al-Duʿā’ 389)