'Keep the Sabbath' in the Bible

And the foreigners who join themselves to the Lordminister to Him, love the name of Yahwehand become His servants,all who keep the Sabbath without desecrating itand who hold firmly to My covenant—

If you keep the Sabbath with care, not doing your business on my holy day; and if the Sabbath seems to you a delight, and the new moon of the Lord a thing to be honoured; and if you give respect to him by not doing your business, or going after your pleasure, or saying unholy words;