Do we still need to observe the Sabbath Day?

A Christadelphian Video: Description: There are three stages concerning the sabbath. Firstly, the nation of Israel was given the commandment of the sabbath, teaching them to understand how God desired their mind to rest entirely on him. Secondly, the disciples of the Lord Jesus Christ were to dedicate their whole lives in service to God. Thirdly, in the Kingdom age, the whole earth will manifest the sabbath by glorifying God in every aspect.