Ezekiel 43:20

43:20 You will take some of its blood, and place it on the four horns of the altar, on the four corners of the ledge, and on the border all around; you will cleanse it and make atonement for it. ¹ 

Ezekiel 45:19

45:19 The priest will take some of the blood of the sin offering and place it on the doorpost of the temple, on the four corners of the ledge of the altar, and on the doorpost of the gate of the inner court.

[43:20]  ¹ sn Note the similar language in Lev 16:18.