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The Religious Authorities of Jesus' day arrive, demanding a miraculous sign to prove Jesus is sent by God. Jesus replies to their demand by telling his disciples to beware of them and reminds them of his two greatest miracles... feeding the 5,000 and feeding the 4,000. Today, this bad yeast exists as those who claim to speak for Jesus whose own messages sound nothing like his teaching. This is the yeast that Jesus tells us, as his disciples, we must beware of, today.