Pir Bahauddin: Why have, you, O Baba Nanak, overlooked both the Hindu and Muslim traditions in their entirety?
Baba Nanak: Listen Bahauddin, I tell you that both the Hindus and the Muslims have degraded themselves by shaving their hair.
Pir Bahauddin: Without the Muslim law, no one can become pure. Without circumcision, a man cannot receive honour in God's court.
Baba Nanak: The real circumcision is to live in God's Will. One should die with the hair intact; the hair with which one is born. He who keeps the hair as God's trust, is really a great man. The first circumcision is the hair and keeping it on the head is to live in His Will. He who keeps the hair intact, lives by honest labour, and shuns other's right, is honoured by God. Some undergo circumcision, others cut holes in their ears; it is only the dishonest who try to tamper with God's gift of completeness of human form.
Finally Guru Nanak declared that with a turban on, the human form becomes complete in all respects and the unshaven hair is the symbol of the one universal religion, which we all inherit at birth.
The sanctity of keeping uncut hair (Kesh) with Keski (Turban) on has been observed by all Sikh Gurus (From Guru Nanak to Guru Gobind Singh) and it was Guru Arjan who wrote in Raag Maru (page 1084 of the Sikh Holy Book.) "Sabat Surat Dastar Sira" which means 'Keep the God-given form intact with a turban donned on your head'.