Allah (SWT) has said in the Noble Qur'an: "I have not created the jinn and humankind for any other purpose except that they should worship Me."
Holy Prophet Mohammad (pbuh) said: "Almighty Allah (SWT) has set the light of my eyes in Salah (Salat, Namaz) and made it the most desirable thing for me, like the food for the hungry and the water for the thirsty. The hungry is contented after the meal and the thirsty is satisfied after drinking water. But my thirst for Salah (Salat, Namaz) is never quenched."
Holy Prophet Mohammad (pbuh) said: "Everything has a face and the face of your religion is Salah (Salat, Namaz); none of you should stain the face of his religion."
Commander of the Believers Imam Ali bin Abi Talib (AS) said: "Almighty Allah (SWT) has ordained the obligation of faith for purification from polytheism and the obligation of Salah (Salat, Namaz) for refraining from pride and arrogance."
Imam Jafar Sadiq (AS) said: "The superiority of Salah (Salat, Namaz) performed in the earliest moments over the one offered in the last moments of its specified time is the same as the superiority of the Hereafter over this world."
Imam Jafar Sadiq (AS) said: "It is quite possible that a person lives for fifty years and not even a single prayer of his is accepted. Is there anything harder and more painful than this? There are some people ... whose prayers ... will not be accepted ... because they belittle Salah (Salat, Namaz), while nothing but good is admitted to Almighty Allah (SWT). How can Almighty Allah (SWT) accept that which is considered to be of little worth?"
Imam Ali bin Moosa Al Ridha (AS) said: "When it is time for Salah (Salat, Namaz), perform your prayers; you never know what will happen afterwards ... Nothing is dearer to Almighty Allah than Salah (Salat, Namaz). Worldly affairs must not detract you from the prayer timings. Do not delay your prayers (from the prescribed timings) for no reason. Always perform your Salah (Salat, Namaz) on its best time."
Imam Ali bin Moosa Al Ridha (AS) said: "When you are praying, avoid being drowsy, slumberous, playing and hastening. Pray with solemnity, gravity and soberness. It is up to you to remain attentive, humble and submissive in Almighty Allah's presence. Stand in front of your Lord as a slave appears before his master. Keep your feet in order and your stature firm. Do not look here and there. Be as if you could see Him; for, if you do not see Him, He sees you."