Importance of 7th Day Sabbath 
Observance among believers

Sabbath study in Russian

Yahweh considered the Sabbath so important, so necessary for His human creation, that He kept it Himself. In fact, the final achievement in His creation of the vast universe--the last act He performed--was to bless, sanctify and rest on the  seventh day:

Genesis 2:2 - And on the seventh day Elohim ended His work which He had done, and He rested on the seventh day from all His work which He had done. 3 Then Elohim blessed the seventh day and sanctified it, because in it He rested from all His work which Elohim had created and made

Exodus 20:8 - Remember the Sabbath day, to keep it holy. 

The Sabbath was important enough to be included in the Ten Commandments. Yet, out of the Ten, most believe in ignoring the one commandment which tell us to "Remember" it.