‘Abdullah bin Mas’ud (may Allah be pleased with him) says that the Messenger of Allah (peace and blessings of Allah be upon him) said:“Pessimism is shirk (associating partners with Allah).”1. (Ibn Mas’ud says:) There is none among us whose heart is not affected by such a thought, but Allah, due to reliance (tawakkul) on Him, removes that thought from the heart. Imam Tirmidhi says:
1- This hadith is hasan sahih; we know it only from the narration of Salamah bin Kuhayl,
2- Shu’bah has also narrated this hadith from Salamah, Imam Tirmidhi says:
3- I heard Muhammad bin Isma’il al-Bukhari say: Sulaiman bin Harb, regarding «وما منا ولكن الله يذهبه بالتوكل» , used to say that «وما منا» in my view is the statement of Abdullah bin Mas’ud (may Allah be pleased with him),
4- There are also narrations in this chapter from Abu Hurairah, Habis Tamimi, A’ishah, Ibn ‘Umar, and Sa’d (may Allah be pleased with them).

Narrated from Anas (may Allah be pleased with him) that the Messenger of Allah (peace and blessings of Allah be upon him) said: "There is no reality in one person's illness being transmitted to another, nor in bad omens or superstitions __QUR_N__, and I like a good omen." The people asked: "O Messenger of Allah! What is a good omen?" He replied: "A good word." Imam Tirmidhi says: This hadith is Hasan Sahih.

Anas bin Malik (may Allah be pleased with him) says that the Prophet Muhammad (peace and blessings be upon him) liked to hear, when he went out for some need, someone say: "O Rashid! O Najeeh!" 1. Imam Tirmidhi says: This hadith is hasan sahih.