What is the Sabbath day Called?
Revelations 1:10
“I was in the Spirit on the Lord’s day, and heard behind me a great voice, as of a trumpet,”

The Sabbath is considered the lords day.

What Day is the lord Days which is called the Sabbath Day?

Exodus 20:10

“But the seventh day is the sabbath of the LORD thy God: in it thou shalt not do any work, thou, nor thy son, nor thy daughter, thy manservant, nor thy maidservant, nor thy cattle, nor thy stranger that is within thy gates:”