Definition of Sikh:

Any human being who faithfully believes in - 

• One Immortal Being

• Ten Gurus (from Guru Nanak Dev to Guru Gobind Singh)

• The Guru Granth Sahib

• The utterances and teachings of the ten Gurus

• The baptism bequeathed by the tenth Guru,

and who does not owe allegiance to any other religion,

is a Sikh.
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