Widow’s Mites, also known as Leptons or Pruta, were the smallest known denomination in ancient Jewish currency. These were regular coins from the Maccabees to the time of Herod, but they became famous worldwide with their mention in the New Testament. The word Mite was not what they were called in Jerusalem at the time of Jesus, but the name was included later in some of the earlier English versions of The Bible.
And He looked up and saw the rich putting their gifts into the treasury, and He saw also a certain poor widow putting in two mites. So He said, “Truly I say to you that this poor widow has put in more than all; for all these out of their abundance have put in offerings for God, but she out of her poverty put in all the livelihood that she had.
—Luke 21:1-4