How do we know that Jesus fulfilled the Old Testament Sabbath?

The fulfillment of the Old Testament Sabbath is established in Hebrews 4, where the author highlights that Jesus, represented as Joshua, provides a new type of rest beyond the physical land of Canaan. When Christ died and rose again, it was the end of the ceremonial Sabbath, ushering in a 'Sabbath of rest' that is wholly spiritual in nature. This new Sabbath reflects our complete acceptance in Christ, where believers rest in His finished work rather than in old legalistic observances. Through His sacrifice, Jesus accomplished the entire demands of the law, and as such, all believers are invited to enter into His rest, which involves ceasing from their own works to trust in His righteousness and grace.