In the fourth episode on the series on the book of Leviticus, Fr. Daniel Poovannathil explains the definition and classification of things and events into ordinary, clean, unclean and their interpretations. We also learn the laws governing certain life or health conditions that are considered as unclean, and the instructions on ritual cleansing surrounding them. This teaching can also be viewed on YouTube at https://youtu.be/_x2_chy6rwQ