bhagwan, bhagwan, bhagwan
o duniya ke rakhwale, sun dard bhare mere naale
sun dard bhare mere naale
aash niraash ke do rango se duniya tune sajaayi
nayyaa sag tufaan banaya, milan ke saath judaayi
jaa dekh liya harjaayi
o lut gayi mere pyaar ki nagri, ab to nir baha le
ab to nir baha le, o ab to nir baha le
o duniya ke rakhwale, sun dard bhare mere naale
sun dard bhare mere naale
aag bani saavan ki barsa, phul bane angaare
naagan ban gayi raat suhaani, patthar ban gaye taare
sab tut chuke hai sahaare, o jivan apna vaapas le le
jivan dene vaale, o duniya ke rakhwale
chaand ko dhudhe pagal suraj, shaam ko dhundhe savera
mai bhi dhundhu us pritam ko, ho naa saka jo mera
bhagwan bhala ho tera, o qismat phuti aas na tuti
paav me pad gaye chhaale, o duniya ke rakhwale
mahal udaas aur galiya suni, chup-chup hai divaare
dil kya ujda duniya ujdi, ruth gayi hai bahaare
ham jivan kaise guzaare, o mandir girta phir ban jaata
dil ko kaun sambhaale
o duniya ke rakhwale, sun dard bhare mere naale
sun dard bhare mere naale
o duniya ke rakhwale, rakhwale, rakhwale, rakhwale

This is Rafi's greatest song ever. In the album "Aathvaan Sur", Naushad offers commentary on this song and it is insightful.
Nuashad said that Rafi-saab (or saheb) could not sing for three days after recording this song. Its composition covers a wide range of the raaga and, of course, multiple octaves. People, remember, this was recorded on one track, in one take (albeit after much practice)!
Rafi rerecorded this song two notes higher! It's part of "Aathvaan Sur".