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"They ask you (O Muhammad sal-Allaahu 'alayhe wa sallam) what is lawful for them (as food ), Say: "Lawful unto you are At-Tayyibat [all kind of Halal (lawful-good) foods which Allaah has made lawful (meat of slaughtered eatable animals, milk products, fats, vegetables and fruits, etc.)], And those beasts and birds of prey which you have trained as hounds, training and teaching them (to catch) in the manner as directed to you by Allaah; so eat of what they catch for you, but pronounce the Name of Allaah over it, and fear Allaah, Verily, Allaah is Swift in reckoning."" [Al-Maa'idah (5):4]

Narrated 'Abdullah:

The Prophet said, "Abusing a Muslim is Fusuq (an evil doing) and killing him is Kufr (disbelief)." Narrated 'Ubada bin As-Samit: "Allah's Apostle went out to inform the people about the (date of the) night of decree (Al-Qadr) but there happened a quarrel between two Muslim men. The Prophet said, "I came out to inform you about (the date of) the night of Al-Qadr, but as so and so and so and so quarrelled, its knowledge was taken away (I forgot it) and maybe it was better for you. Now look for it in the 7th, the 9th and the 5th (of the last 10 nights of the month of Ramadan)." [The Book of Faith Volume 1, Book 2, Hadeeth 46]