What analogy did Sai Baba use to condemn slander and gossip?

Sai Baba used a powerful and visceral analogy to teach about the foulness of slander. As recounted in Chapter 19, while walking with his devotees, he pointed to a village sow feasting on excrement. He directly compared this to a slanderer, asking his followers to observe the sow's taste for filth and relating it to a person who 'picks through people's excrement' and 'rages against brothers and kin' with their words. Baba questioned what happiness Shirdi could offer such a 'self-destroyer' who wastes their precious human birth on such activities.