When one of you enters the toilet let him say: I seek refuge with Allah from the filthy, impure, accursed Satan

It is narrated from Sayyiduna Zayd bin Arqam (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "These toilets are frequented (by jinn and devils), so when one of you goes there, let him say: 'A'udhu billahi min al-rijs al-najis al-shaytan al-rajim' (I seek refuge in Allah from the impure, the filthy, the accursed Satan)."
Imam Muslim narrated through Qatadah (by this route), and Imam Bukhari used Amr bin Marzuq as evidence; however, there is disagreement over this narration from Qatadah.

It is narrated from Sayyiduna Zayd bin Arqam (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "These toilets are frequented (by jinn and devils), so when one of you goes there, let him say: '(O Allah!) I seek refuge in You from the male and female evil jinn.'"
Imam al-Hakim says: Both chains are on the condition of the Sahih, but the two Shaykhs did not record it with these words; they only agreed on the narration of Sayyiduna Anas (may Allah be pleased with him).

It is narrated from Sayyiduna Anas (may Allah be pleased with him) that when the Prophet (peace and blessings be upon him) entered the toilet, he would take off his ring.

It is narrated from Sayyiduna Anas (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) wore a ring engraved with "Muhammad Rasulullah (Muhammad is the Messenger of Allah)", and when he (peace and blessings be upon him) went to the toilet he would take it off.
Imam al-Hakim says: This hadith is sahih (authentic) on the condition of the two Shaykhs, but they only recorded the mention of the ring's engraving.

It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) concerning the saying of Allah Almighty: "In it are men who love to purify themselves" [Surah al-Tawbah: 108], that when this verse was revealed, the Messenger of Allah (peace and blessings be upon him) sent for Uwaym bin Sa'idah (may Allah be pleased with him) and asked: "What is this purity for which Allah has praised you?" He said: "O Prophet of Allah! Whenever any man or woman among us finishes relieving himself, he washes his private part (with water)." He (peace and blessings be upon him) said: "So this is it (the reason for the praise)."
This hadith is sahih (authentic) on the condition of Imam Muslim, but the two Shaykhs did not record it.

The nephew of Sayyiduna Abu Ayyub al-Ansari (may Allah be pleased with him) narrates from his uncle that the Companions said: "O Messenger of Allah! Who are these people about whom this verse was revealed: 'Men who love to purify themselves, and Allah loves those who purify themselves' [Surah al-Tawbah: 108]?" He (peace and blessings be upon him) said: "They are people who used to cleanse themselves after relieving themselves (istinja) with water, and they would not sleep the whole night (but would worship)." Imam al-Hakim says: Here ends the part of the Book of Purification that was on the condition of the two Shaykhs but which they did not record. [Beginning of the Book of Prayer] [Chapter: The Times of Prayer]