What episode is Merlin the sword in the stone?

In the animated film "The SWord in the Stone," Merlin is a key character who serves as a mentor to the young Arthur. The story is based on the legend of King Arthur, where Arthur pulls the sWord Excalibur from the stone, proving his right to the throne. This film was released by Disney in 1963 and is not an episode of a series but a standalone animated feature.