Leviticus 4:28-30

28When they become aware of their sin, they must bring as an offering for their sin a female goat with no defects.

29They must lay a hand on the head of the sin offering and slaughter it at the place where burnt offerings are slaughtered.

30Then the priest will dip his finger in the blood and put it on the horns of the altar for burnt offerings. He will pour out the rest of the blood at the base of the altar.