This verse by verse Bible Study focuses primarily on Isaiah 56: Blessed is He Who Keeps from Defiling the Sabbath.
Please review the UCG Study Paper: "Principles of Sabbath Observance, Eating Out on the Sabbath" as a supplement to this Bible Study.
The link is in the Downloads section and can also be found at https://ucgweb.s3.amazonaws.com/files/papers/UCG-papers-Principles-of-Sabbath-Observance.pdf