Columbo
Lieutenant
Rondo
scam.gawd*There's different kinds of passing, it depends on what you mean. Whose the best set up man? Whose the most cerebral passer? Who had the nicest passing highlights? Who gets the most assists?
It's hard to measure this. If we're balancing all of them together then it's either Rondo, Nash, LeBron or Westbrook probably.

Lebron?
JKidd, Penny, Nash, and Stockton come to mind