In shulchan aruch (code of Jewish law). Also see Mishnah Berurah.
Yes.
Because for 3300 years the Jews have kept the Torah-tradition of Shabbat-observance.
1. It is commanded in the Torah just like Shabbat 2. It shows love for the Torah
Judaism. See these two links for more about the Torah and the Shabbat.
A dvar Torah before Musaf on Shabbat is a way to enhance the spiritual experience of the service by providing insights and reflections on the weekly Torah portion or other Jewish teachings. It helps to connect the congregation to the themes of Shabbat and inspire them to deepen their understanding and connection to the prayers they are about to recite.
After Friday night services and on Shabbat morning after services, we come home, often with guests, make kiddush (blessing over wine) and a blessing over two loaves of bread, and have a leisurely multi-course Shabbat meal including singing and words of Torah. Customarily, that week's Torah-reading (parsha) will be a topic of conversation; and the children of the family will have a chance to speak of what they've learned in school. Eating the traditional Shabbat meals is a mitzva (a Torah-precept), to which the sages of the Talmud (Shabbat 117b) found an allusion in the Torah (Exodus 16:25).
The Shabbat is a major Torah-command; one that keeps a strong bond between us and God.The Shabbat is one of the times that the Torah is read. This reminds us of our beliefs and obligations.The Shabbat is a time when the whole community congregates.
The Creation and the Exodus, as well as the Giving of the Torah and the World to Come.
The Creation and the Exodus, as well as the Giving of the Torah and the World to Come.
Traditional Jews observe Shabbat because the day of rest is commanded in the Torah. It is one of the 10 commandments. Non-Tradtional Jews may have different motivations, but most agree that it is a deeply rooted tradition that enhances our lives.
Learn and keep His Torah as much as possible (Deuteronomy ch.10).
It is a Rabbinic command going all the way back, since it is stated in the Mishna (the Oral Torah). Mishna Shabbat chapter 2.