Why did Jesus keep the Sabbath? He kept the sabbath for the same reason He kept all the other Mosaic laws. He also observed the feasts. Jesus did these things because He was born a Jew, born under the law, that He might fulfill it and redeem His people from its penalty and bondage.
Galatians 4:4 But when the fulness of the time was come, God sent forth his Son, made of a woman, made under the law,
Galatians 4:5 To redeem them that were under the law, that we might receive the adoption of sons.
Galatians 5:14 For all the law is fulfilled in one word, even in this; Thou shalt love thy neighbour as thyself.
Galatians 4:4 But when the fulness of the time was come, God sent forth his Son, made of a woman, made under the law,
Galatians 4:5 To redeem them that were under the law, that we might receive the adoption of sons.
Galatians 5:14 For all the law is fulfilled in one word, even in this; Thou shalt love thy neighbour as thyself.