Sabbath is a set period of time observed from 20 minutes before sunset on Friday until 40 minutes after sunset on Saturday. While nothing is truly necessary to "close" sabbath per se, orthodox Jews will pray the evening prayers and perform a ritual called "Havdalah", which means separation. This is meant to distinguish between the holiness of the sabbath and the mundaness of the week. Sabbath observant Jews will perform the havdalah ceremony before resuming week like activities (i.e. driving, making calls, turning on lights). However from a strict Jewish law perspective, one may simply say, "Sabbath is over" to legally start activities, provided that the 40 minutes after sunset has passed.
All Sabbath-observers keep the Sabbath holy; and Hassidim are among them.
It is likely David did, since he was a Jew.
Remember the Sabbath day to keep it holy.
To keep the ordinances and commandments of God in keeping pure and spotless on sabbath day.
no
Yes. Exodus 20:8, " Remember the Sabbath day and keep it holy" (Wikipedia)
The sabbath is one of the defining characteristics of seventh-day denominations, including Seventh Day Baptists.
The Seventh Day.
Remember the sabbath day, and keep it holy.
If you're Jewish and that matters to you, then you do.
Not at all!
Sabbatarianism is the principles and beliefs of one who follows the Sabbath, in general, one who keeps the Sabbath.