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"Muhammad (SAW) is the Messenger of Allaah, and those who are with him are severe against disbelievers, and merciful among themselves, You see them bowing and falling down prostrate (in prayer), seeking Bounty from Allaah and (His) Good Pleasure, The mark of them (i.e, of their Faith) is on their faces (foreheads) from the traces of (their) prostration (during prayers), This is their description in the Tauraat (Torah), But their description in the Injeel (Gospel) is like a (sown) seed which sends forth its shoot, then makes it strong, it then becomes thick, and it stands straight on its stem, delighting the sowers that He may enrage the disbelievers with them, Allaah has promised those among them who believe (i.e, all those who follow Islaamic Monotheism, the religion of Prophet Muhammad sal-Allaahu 'alayhe wa sallam till the Day of Resurrection) and do righteous good deeds, forgiveness and a mighty reward (i.e, Paradise)." [Al-Fath (48):29]

Narrated 'Aa'ishah:

Once the Prophet came while a woman was sitting with me. He said, "Who is she?" I replied, "She is so and so," and told him about her (excessive) praying. He said disapprovingly, "Do (good) deeds which is within your capacity (without being overtaxed) as Allah does not get tired (of giving rewards) but (surely) you will get tired and the best deed (act of Worship) in the sight of Allah is that which is done regularly." [The Book of Faith Volume 1, Book 2, Hadeeth 41]