'Sabbath Day' in the Bible

And yet the house of Israel rebelled against me in the wilderness. They would not walk in my commandments; they have cast away my laws, which whoso keepeth should live in them; and my Sabbath days have they greatly unhallowed. Then I made me to pour out my indignation upon them, and to consume them in the wilderness.

Notwithstanding, their sons rebelled against me also: they walked not in my statutes, they kept not my laws to fulfill them, which he that doth shall live in them; neither hallowed they my Sabbath days. Then I made me again to pour out my indignation over them, and to satisfy my wrath upon them in the wilderness.