Jesus offered his own example to demonstrate what leadership in God’s kingdom means.
Jesus understands his death as a ransom. A ransom was a payment made to free a slave or captive.
The phrase for many likely refers to Isaiah 53:12, where many means all (compare Romans 5:15, 18–20). The death of Jesus was for all humanity. Later, Jesus would speak of his blood as being "poured out for many" (Mark 14:24).