ISB ~ Hebrews 10 v1

a shadow:The sacrifices of the Law merely prefigured the perfect sacrifice of Christ (Col 2:16-17) (CCC 128).

the true form:Or, “the true image”. The expression implies that the liturgy of the New Covenant, which celebrates the saving work of Christ, still utilizes visible and sacramental signs for worship. So, for example, the ceremonial “food and drink”, as well as the “baptisms” of the Levitical order (Heb 9:10), foreshadow the sacraments of the Eucharist (13:10) and Baptism (10:22) (CCC 1145-52). See notes on Heb 6:4 and 13:10.