Hebrews 9:19

For when every commandment had been spoken by Moses unto all the people according to the law, he took the blood of the calves and the goats, with water and scarlet wool and hyssop, and sprinkled both the book itself and all the people, saying, This is the blood of the covenant which God commanded to you-ward. Moreover the tabernacle and all the vessels of the ministry he sprinkled in like manner with the blood. And according to the law, I may almost say, all things are cleansed with blood, and apart from the shedding of blood there is no remission.

The obstinate problem the author of Hebrews was dealing with in these verses was the prejudice of Jewish Christians who found the cross of Christ an offense and who were inclined to stumble at the death of Christ. This mention of all that blood and sprinkling is for the purpose of showing that all of the ancient typical institutions called for bloodshedding, not occasionally, but continually, such things being suggestive and typical of the death of Christ. Again from Lenski,

Since there was so much use of blood in connection with the Mosaic testament and all that pertained to that testament, how can any of the readers find fault with Christ's death and blood in connection with the new testament? They should do the very opposite: appreciate the fact that Christ's death and blood are infinitely more precious than all the Mosaic sacrifices.[15]