Final answer:
The verse in question is from the Gospel of Matthew, Matthew 20:28, and highlights Jesus's role as a servant.
Step-by-step explanation:
The verse "Just as the Son of Man did not come to be served, but to serve..." is found in the Gospel of Matthew, specifically in Matthew 20:28. This particular verse is a significant part of Christian theology, as it encapsulates the teaching on the role and purpose of Jesus Christ, who is referred to as the Son of Man in this context. The Gospels of Mark, Luke, and John, though they share many similar teachings and events, do not contain this exact verse. It is unique to the Gospel of Matthew, emphasizing Jesus's role as a servant and his act of self-sacrifice.