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.
Yes. Exodus 20:8, " Remember the Sabbath day and keep it holy" (Wikipedia)
yes. sabbath played with zeppelin all the time
To the best of my knowledge this individual is not, nor has he ever been one of Jehovah's Witnesses.
The Seventh Day.
If you're Jewish and that matters to you, then you do.
Remember the sabbath day, and keep it holy.
Not at all!
There is no evidence over the net to accually answer with a absolute certainty. If he is, then he is, if he isnt, then he isnt.