How did sin get on the altar?

If the sin offering removed sin, and Moses used blood to remove sin from the altar, how did sin get on the altar? Leviticus 4 and the Sin Offering Leviticus 4:35 The priest is to remove all the fat just like the fat of the lamb is removed from the Peace Offering. Then the priest will burn it on the altar along with the food offerings to the LORD . In this way the priest will make atonement on his behalf for the sin he has committed, and he will be forgiven. If you love Leviticus, please share the love! Just hitting the subscribe button to really helps !! 😊 If you love Leviticus, and you want more, head here: https://www.ubiquitousleviticus.com