This is not a song but Shabad from sikh holy book Guru Granth Sahib. This Shabad is by Guru Arjan Dev Ji in Raag Gauree on Pannaa 182

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This is a shabad which i used to recite a lot when i was a kid...although its the first time i have sung it in my own music.

jaa kai vas khaan sulathaan ||
jaa kai vas hai sagal jehaan ||
jaa kaa keeaa sabh kishh hoe ||
this thae baahar naahee koe ||1||
kahu baena(n)thee apunae sathigur paahi ||
kaaj thumaarae dhaee nibaahi ||1|| rehaao ||
sabh thae ooch jaa kaa dharabaar ||
sagal bhagath jaa kaa naam adhhaar ||
sarab biaapith pooran dhhanee ||
jaa kee sobhaa ghatt ghatt banee ||2||
jis simarath dhukh ddaeraa dtehai ||
jis simarath jam kishhoo n kehai ||
jis simarath hoth sookae harae ||
jis simarath ddoobath paahan tharae ||3||
sa(n)th sabhaa ko sadhaa jaikaar ||
har har naam jan praan adhhaar ||
kahu naanak maeree sunee aradhaas ||
sa(n)th prasaadh mo ko naam nivaas ||4||21||90||