A.T. Robertson Commentary Colossians 2:17

"which are a shadow of the things to come; but the body is Christ`s." — Colossians 2:17 (ASV)

A shadow (σκια). Old word, opposed to substance (σωμα, body). In Heb 10:1 σκια is distinguished from εικων (picture), but here from σωμα (body, substance). The σωμα (body) casts the σκια (shadow) and so belongs to Christ (Χριστου, genitive case).