Sirach 21:28, "A whisperer defiles his own soul, And will be hated wherever he sojourneth," speaks to the destructive nature of gossip and spreading malicious rumors. Let's break down the meaning:

"A whisperer defiles his own soul": This part emphasizes the moral and spiritual damage the gossip inflicts on themselves. By engaging in spreading negative information about others behind their back, the whisperer degrades their character and pollutes their inner self. It suggests that engaging in such behavior is detrimental to one's own integrity and moral standing. It can be interpreted as:

Moral Corruption: The act of whispering and spreading rumors is inherently unethical and stains the whisperer's conscience.
Spiritual Degradation: It damages their connection to virtue and goodness, potentially hindering their spiritual growth.
Psychological Harm: The act of spreading negativity can lead to feelings of guilt, shame, and a general sense of unease within the whisperer.

"And will be hated wherever he sojourneth": This part highlights the social consequences of being a gossip. The whisperer's reputation will precede them, and they will be disliked and distrusted no matter where they go.

Loss of Trust: People recognize that a whisperer cannot be trusted, as they are willing to betray confidences and spread harmful information.
Social Isolation: Eventually, people will avoid the whisperer to protect themselves from being the subject of their gossip.
Negative Reputation: Their name will become synonymous with untrustworthiness and malice, making it difficult to form genuine relationships.

In essence, the verse warns against the dangers of gossip and slander. It points out that spreading rumors not only harms the reputation and well-being of others but also corrupts the character of the person doing the whispering and leads to their own social alienation. It underscores the importance of integrity, discretion, and speaking well of others.