The original movie was Saathi 1968 and the song was sung by Lata Mangeshkar,


Here is lyrics of the song 
(dedicated to Osho with his pictures)

aahat pe halki halki chaati dhadke paayal ki
aahat pe halki halki chaati dhadke paayal ki
har gori se na muska ye lahre pooche aanchal ki
chupke chupke raadha koyi poochhe apne shyam se
ye kaun aaya


kyaa kahiye is aane ko, aayaa hai tarsaane ko
aayaa hai tarsaane ko
dekhaa usne hans hans ke,har apne begaane ko
lekin kitnaa beparwaah hai, mere hi salaam se
ye kaun aayaa, roshan ho gayi mahfil kiske naam se
mere ghar mein jaise sooraj nikla hai shaam se
ye kaun aayaa

and here is translation of meaning...

the person who is very close to her heart has arrived
and the feel of his coming increase her heartbeat

what to say about his arrival,
 he came to make me thirsty for life,
 he saw to his fans with laughter.
 but how indifferent he is with me.

when he arrived at my home at evening,
 the sun rise at the evening
...
video is on youtube for sometime..who knows