High Quality Content by WIKIPEDIA articles! The Parable of the Leaven (also called the Parable of the yeast) is one of the shorter parables of Jesus. It appears in two of the Canonical gospels of the New Testament. The differences between Gospels of Matthew (13:33) and Luke (13:20–21) are minor. In both places it immediately follows the Parable of the Mustard Seed, which shares this parable`s theme of the Kingdom of Heaven growing from small beginnings.