Carol Burnett posted a heartfelt goodbye to the late star on Thursday, sharing a black-and-white photo of the two on set in 1964.

“I had the great pleasure of working with Bob and being his friend,” Burnett captioned. “He was as kind and nice as he was funny. He will be missed.”

Many other collaborators and friends of Newhart, including “Elf” director Jon Favreau, also shared tributes.

“Bob Newhart was a comedy icon. His deadpan delivery was so infectious both on and off screen. I am grateful to have known him and will always treasure our collaboration,” Favreau said in a statement to CNN on Friday.

Several castmates from “The Big Bang Theory” shared their memories as well.

Johnny Galecki posted a series of photos on Instagram, writing, “In one of his last emails to me, Bob requested that I stop telling people he’s a ‘nice guy.’ Though I hate to disobey a hero, I must share that Bob was a wonderful man and I cherished my time with him.”

“Safe passage, my friend,” he added.