“Better sacrifices” is plural only because the statement is general in
form; in reality the heavenly Sanctuary, of which the Tabernacle is only a
copy, needs only the one sacrifice of Christ. (R. C. H. Lenski, The
Interpretation of the Epistle to the Hebrews and of the Epistle of James [Columbus,
Ohio: Lutheran Book Concern, 1938], 314)
