Volumn 001, Book 008, Hadith Number 346.
-----------------------------------------
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.
-----------------------------------------
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."

V#1, B#12, H#700.
Narated By Anas bin Malik : Allah's Apostle fell from a horse and got injured so he led the prayer sitting and we also prayed sitting. When he completed the prayer he said, "The Imam is to be followed; if he says Takbir then say Takbir, bow if he bows; raise your heads when he raises his head, when he says, 'Sami' a-l-lahu Liman hamida say, 'Rabbana laka-l-hamd', and prostrate when he prostrates."

Volumn 001, Book 012, Hadith Number 701.
-----------------------------------------
Narated By Abu Huraira : The Prophet said, "The Imam is to be followed. Say the Takbir when he says it; bow if he bows; if he says 'Sami a-l-lahu Liman hamida', say, ' Rabbana wa-laka-l-hamd', prostrate if he prostrates and pray sitting altogether if he prays sitting."

ALLAH k RASOOL S.A.W.W ne isrhad farmaya hai k deko tum mei se merey baad jo koi b rahega woh kaseer ikhtilaafat dekega tum per laazim hai k tum meri sunnat ko thaamay rehna aur meray khulfaaye raashideen ki sunnat ko thaamay rehna aur mazbooti se pakar kar rakna,,,[abu daaood]

حضرت ابو ہریرہ رضی الله تعالیٰ عنھ سے روایت ہے: پیارے نبی پاک صلی اللہ علیہ وآلہ وسلم نے ارشاد فرمایا کہ: جو شخص یہ چاہے کہ تنگی تکلیف کے وقت اسکی دعایں قبول ہوں تو اسے چاہیے کہ خوشحالی کے وقت دعا کی کثرت کرے.


حوالہ: ترمزی، مشکوة، ح 2133


Narrated Hazrat Abu Huraira (R.A): Dear Prophet (S.A.W.W) Said: If a person wants that ALLAH (S.A.TA'ALA) accept his prayers in hard times, he should also pray in the time of ease