Definition: The term "fpd" in Christianity typically refers to a type of religious practice known as baptism. In this context, baptism often involves water immersion (feasting on unleavened bread) for 3 days in order to cleanse one from sin and enter into spiritual life as a disciple. It's important to note that in the Bible, "fpd" is a term used to refer to Jesus' baptism by John, which was recorded as being done in Jerusalem at Pentecost (Acts 2:40). This practice has since been widely followed in Christianity for many years.