Deeno Duniya Dar Kamande Aa Pari Rukhsaar-e-maa||
Har do aalam keemat-e-yak taar-e-moo-e-yaar-maa||

Bhai Nandlal jee has called Siri Guru Dasmesh jee's face - Pari Rukhsaar i.e. beautiful as fairies (pari means extremely beautiful). Vaheguru knows in what mauj Bhai Nandlal jee remembered Guru Sahib this way. In the next line Bhai Sahib goes on to write that the two worlds (this world and the next one) are merely equal to one hair (moo) of his yaar - Siri Guru Gobind Singh jee Maharaaj.

Daas,
Kulbir Singh