Chandler: (there's a knock on Chandler's door) That's great... With my luck, that's gonna be him.
Phoebe: Him? ...Ross?
Chandler: No, Hymn 253... "His Eyes are on the Sparrow."
"His Eye Is on the Sparrow" is a traditional gospel spiritual, originally written in 1905 by Civilla D. Martin and Charles H. Gabriel.