Volumn 001, Book 003, Hadith Number 095.
Narated By Anas : Whenever the Prophet spoke a sentence (said a thing), he used to repeat it thrice so that the people could understand it properly from him and whenever he asked permission to enter, (he knocked the door) thrice with greeting.

Volumn 001, Book 003, Hadith Number 106.
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Narated By 'Ali : The Prophet said, "Do not tell a lie against me for whoever tells a lie against me (intentionally) then he will surely enter the Hell-fire."

Volumn 001, Book 003, Hadith Number 109.
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Narated By Salama : I heard the Prophet saying, "Whoever (intentionally) ascribes to me what I have not said then (surely) let him occupy his seat in Hell-fire."

Volumn 001, Book 003, Hadith Number 122.
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Narated By Jarir : The Prophet said to me during Hajjat-al-Wida': Let the people keep quiet and listen. Then he said (addressing the people), "Do not (become infidels) revert to disbelief after me by striking the necks (cutting the throats) of one another (killing each other)."

Volumn 001, Book 008, Hadith Number 346.
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Narated By 'Aisha : The mother of believers: Allah enjoined the prayer when He enjoined it, it was two Rakat only (in every prayer) both when in residence or on journey. Then the prayers offered on journey remained the same, but (the Rakat of) the prayers for non-travellers were increased.

Volumn 001, Book 011, Hadith Number 580.
Narated By Anas bin Malik : When the number of Muslims increased they discussed the question as to how to know the time for the prayer by some familiar means. Some suggested that a fire be lit (at the time of the prayer) and others put forward the proposal to ring the bell. Bilal was ordered to pronounce the wording of Adhan twice and of the Iqama once only.

Volumn 001, Book 011, Hadith Number 587.
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Narated By Yahya as above (586) and added : "Some of my companions told me that Hisham had said, "When the Mu'adhdhin said, "Haiya alas-sala(t) (come for the prayer)." Muawiya said, "La hawla wala quwata illa billah (There is neither might nor any power except with Allah)" and added, "We heard your Prophet saying the same."