John Lewis amassed many accolades and honors throughout his lifetime as a civil rights icon and congressman.

However, one of the lesser known moments in Lewis’ lengthy legacy may be when he made a special guest appearance on the long-running PBS children’s animated series “Arthur.” A clip of the episode was re-posted on social media and widely shared this weekend as the world mourned Lewis, who died Friday at the age of 80.

The episode featuring Lewis is called “Muffy Misses Out/Arthur Takes a Stand.” In it, Lewis meets with Arthur and his classmates. “There’s nothing more important than following your conscience,” an animated version of Lewis says in the cameo appearance. “If you can do that, you’re always going to sleep well.”

In the episode, which first aired in 2017, Lewis encourages Arthur to stand up to an injustice against beloved lunch lady Mrs. MacGrady, who also happens to be a friend of Lewis'. The episode also highlights Lewis’ record as a civil rights pioneer.

On Saturday morning, the show’s Facebook page was among those to remember Lewis’ life and legacy.

“Civil rights hero John Lewis told Arthur ‘a person with conviction can change the world.' And he did change the world. Thank you for all your good trouble and words of wisdom. During his life, Rep. Lewis’s actions inspired many people to take a stand for what is right,” the Facebook post reads.

The show also encouraged parents and guardians to watch the episode with their youngsters “and talk with your kids about his legacy.” The episode can be viewed here.