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Hebrews 9:19ESV·author unknown

For when every commandment of the law had been declared by Moses to all the people, he took the blood of calves and goats, with water and scarlet wool and hyssop, and sprinkled both the book itself and all the people,

Matthew Henry Presbyterian @wholebiblehenry

In these verses the apostle considers the gospel under the notion of a will or testament, the new or last will and testament of Christ, and shows the necessity and efficacy of the blood of Christ to make this testament valid and effectual. I. The gospel is here considered as a testament, the new and last will and testament of our Lord and Saviour Jesus Christ.

Commenting on Hebrews 9:15-22

John Gill Reformed Baptist @doctorgill

For when Moses had spoken every precept,.... Contained in the decalogue, in the book of the covenant, everyone of the precepts in Exo 22:1 for this is to be understood of the written law, and not of the oral law the Jews talk of, which they say Moses first delivered by word of mouth to Aaron, then to his two sons, Eleazar and Ithamar, then...

Albert Barnes Presbyterian @notesbybarnes

Verse 19. For when Moses had spoken every precept to all the people. When he had recited all the law, and had given all the commandments entrusted Him to deliver, He took the blood of calves and of goats. This passage has given great perplexity to commentators from the fact that Moses, in his account of the transactions connected with the ratification of the covenant...