Definition and Symbolism
The term "sheep's clothing" is derived from the metaphorical language used in the Bible to describe a deceptive appearance. It refers to the outward appearance of innocence and harmlessness that conceals a more dangerous or malevolent nature. This imagery is most famously used in the context of false prophets and teachers who disguise their true intentions to mislead the faithful.

Biblical Reference
The primary biblical reference to "sheep's clothing" is found in the Gospel of Matthew. Jesus warns His followers about the dangers of false prophets, saying: "Beware of false prophets. They come to you in sheep’s clothing, but inwardly they are ravenous wolves" (Matthew 7:15). This passage highlights the contrast between the external appearance and the internal reality, emphasizing the need for discernment among believers.

Context and Interpretation
In the context of Matthew 7, Jesus is teaching about the importance of recognizing true righteousness and the dangers of being led astray by those who appear to be godly but are not. The imagery of "sheep's clothing" is particularly powerful in an agrarian society where sheep were common and valued for their gentleness and usefulness. Wolves, on the other hand, were known predators, posing a significant threat to sheep. By using this metaphor, Jesus underscores the potential harm that false prophets can inflict on the spiritual well-being of the community.

Theological Implications
From a theological perspective, the concept of "sheep's clothing" serves as a cautionary reminder of the presence of evil and deception within the world. It calls believers to exercise vigilance and discernment, relying on the guidance of the Holy Spirit to distinguish between true and false teachings. The metaphor also reflects the broader biblical theme of the battle between good and evil, where appearances can be deceiving, and truth must be sought earnestly.

Application for Believers
For contemporary Christians, the warning about "sheep's clothing" remains relevant. In a world filled with diverse teachings and ideologies, the need for discernment is as critical as ever. Believers are encouraged to test all teachings against the truth of Scripture, to seek wisdom through prayer, and to remain grounded in their faith community. The metaphor serves as a reminder to look beyond superficial appearances and to evaluate the fruits of one's actions and teachings, as Jesus further instructs: "By their fruit you will recognize them" (Matthew 7:16).

Historical and Cultural Insights
Historically, the metaphor of "sheep's clothing" has been used throughout Christian literature and sermons to address the issue of heresy and false doctrine. Church fathers and reformers have often invoked this imagery to warn against those who would distort the gospel for personal gain or to lead others astray. The enduring nature of this metaphor speaks to its effectiveness in conveying the dangers of spiritual deception.

Conclusion
While the Bible does not provide an exhaustive list of characteristics of those who come in "sheep's clothing," the emphasis is on the need for spiritual vigilance and the pursuit of truth. The metaphor serves as a timeless warning to guard against deception and to remain steadfast in the faith.