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"Verily, the Muslims (those who submit to Allaah in Islaam) men and women, the believers men and women (who believe in Islaamic Monotheism), the men and the women who are obedient (to Allaah), the men and women who are truthful (in their speech and deeds), the men and the women who are patient (in performing all the duties which Allaah has ordered and in abstaining from all that Allaah has forbidden), the men and the women who are humble (before their Lord Allaah), the men and the women who give Sadaqat (i.e, Zakaat, and alms, etc.), the men and the women who observe Sawm (fast) (the obligatory fasting during the month of Ramadaan, and the optional Nawaafil fasting), the men and the women who guard their chastity (from illegal sexual acts) and the men and the women who remember Allaah much with their hearts and tongues (while sitting, standing, lying, etc, for more than 300 times extra over the remembrance of Allaah during the five compulsory congregational prayers) or praying extra additional Nawaafil prayers of night in the last part of night, etc.) Allaah has prepared for them forgiveness and a great reward (i.e, Paradise)." [Al-Ahzaab (33):35]

Narrated Al-Bara' (bin 'Azib):

When the Prophet came to Medina, he stayed first with his grandfathers or maternal uncles from Ansar. He offered his prayers facing Baitul-Maqdis (Jerusalem) for sixteen or seventeen months, but he wished that he could pray facing the Ka'ba (at Mecca). The first prayer which he offered facing the Ka'ba was the 'Asr prayer in the company of some people. Then one of those who had offered that prayer with him came out and passed by some people in a mosque who were bowing during their prayers (facing Jerusalem). He said addressing them, "By Allah, I testify that I have prayed with Allah's Apostle facing Mecca (Ka'ba).' Hearing that, those people changed their direction towards the Ka'ba immediately. Jews and the people of the scriptures used to be pleased to see the Prophet facing Jerusalem in prayers but when he changed his direction towards the Ka'ba, during the prayers, they disapproved of it. Al-Bara' added, "Before we changed our direction towards the Ka'ba (Mecca) in prayers, some Muslims had died or had been killed and we did not know what to say about them (regarding their prayers.) Allah then revealed: And Allah would never make your faith (prayers) to be lost (i.e. the prayers of those Muslims were valid).' " (2:143). [The Book of Faith Volume 1, Book 2, Hadeeth 39]