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"It is not Al-Birr (piety, righteousness, and each and every act of obedience to Allaah, etc.) that you turn your faces towards east and (or) west (in prayers); but Al-Birr is (the quality of) the one who believes in Allaah, the Last Day, the Angels, the Book, the Prophets and gives his wealth, in spite of love for it, to the kinsfolk, to the orphans, and to Al-Masakin (the poor), and to the wayfarer, and to those who ask, and to set slaves free, performs As-Salaat (Iqaamat-as-Salaat), and gives the Zakaat, and who fulfill their covenant when they make it, and who are As- Sabirin (the patient ones, etc.) in extreme poverty and ailment (disease) and at the time of fighting (during the battles), Such are the people of the truth and they are Al-Muttaqoon (the pious believers of Islaamic Monotheism)." [Al-Baqarah (2):177]

Narrated 'Abdullah:

When the following Verse was revealed: "It is those who believe and confuse not their belief with wrong (worshipping others besides Allah.)" (6:83), the companions of Allah's Apostle asked, "Who is amongst us who had not done injustice (wrong)?" Allah revealed: "No doubt, joining others in worship with Allah is a great injustice (wrong) indeed." (31.13) [The Book of Faith Volume 1, Book 2, Hadeeth 31]