A.T. Robertson Commentary Hebrews 9:20

"saying, This is the blood of the covenant which God commanded to you-ward." — Hebrews 9:20 (ASV)

This is (τουτο). Instead of ιδου of the LXX (Exodus 24:8), just like our Lord's words in Mr 14:24, a possible reminiscence of the Master's words (Dods). The author also has ενετειλατο (he commanded) for διεθετο of the LXX.