Najasaat means the thing that is unclean in itself, and makes other things unclean by contact.
There are 10 Najasaat:-
1. And 2. Urine and Stool
The Urine and Stool of the following living beings
I. Human Beings
II. The animal, whose meat is haram to eat, and whose blood gushes when its great
artery is cut.
III. An animal which eats excretion
IV. A sheep which has been nursed by a she pig
An animal with which a human being has had a sexual intercourse.
The semen of human beings and
of every animal whose blood gushes when its great artery is cut, is impure.
4. Dead Body
The dead body
of a human being is impure. Similarly the dead body of an animal whose blood gushes while slaughtering is impure if it dies
a natural death or is killed in a manner other than that prescribed by religious law. As the blood of a fish does not gush,
its dead body is pure, even if it dies in water.
Those parts of a dead body (whether of a human being or of an animal)
are pure which do not posses life in it like nails, teeth, hair, bones, horns etc.
of a human being and of every animal whose blood gushes when its great artery is cut is impure. The blood of a fish or a mosquito
is pure because it does not gush.
6. And 7. Dogs and Pigs
The dogs and pigs that live on land are impure
and even their hair, bones, paws and every liquid substance of their body is impure. However, aquatic dogs and pigs are pure.
A kafir is a person who denies Allah or the Day of Judgment, or associates anyone else with Allah, is impure.
As for the people of the Scriptures (Jews and Christians) who do not accept and believe in Prophet Muhammed (peace be on him
and his progeny) they are known to be impure.
9. Alcoholic Liquor
All Alcoholic liquors and beverages
that intoxicate a person, are najis.
10. Beer (Fuqqa)
Note: Sweat of an animal who persistently eats
najasat is najis.