The answer is: Gave them back

Matt 27:3-4 - He threw them down in front of the chief priests and elders, and being tainted money they decided they couldn't put it in the treasury and so bought a field instead in which to bury strangers

When Judas Iscariot realized the enormity of his actions, he was overcome with remorse and returned the 30 pieces of silver—the price of betrayal. Rather dramatically, he threw the coins down at the feet of the chief priests and elders, demanding absolution for his meanness. This moment is profound, not merely because it reflects Judas's regret, but also because it sets a stark contrast against the indifference of those who paid him. They couldn't accept the blood money into the temple treasury, which is fascinating. It shows a compelling aspect of this story: the spiritual versus the material.

Interestingly, the coins ended up being used to buy the Potter's Field, a place designated for the burial of strangers. This field’s purpose linked to an ancient prophecy found in Zechariah 11:12-13 and serves as a dark reminder of wasted betrayal morphing funereally into lost lives. Imagine that field filling up with the remnants of human sorrow— it turns into a place of refuge, ironically for those who, like Judas, lived on society's periphery.

Furthermore, outsiders can draw a significant moral here: when faced with our own wrongdoings, do we choose genuine remorse or allow it to turn our lives into a cautionary tale? The transaction between silver and story results not only in a vacant graveyard but in a lifetime of reflection for the reader, illustrating personal responsibility amidst the fringes of humanity. Intrigued, you might ask, how many twists in our own journeys lead us to seek redemption?