Orthodox Jews abide by the commands of the Torah and the Oral Torah (Talmud).
It is God's covenant and its mitzvoth (commands) are binding upon Jews.
Because God commands it (Deuteronomy ch.14).
the Torah commands us to separate meat and dairy foods.
In order to observe the Torah-commands in Deuteronomy ch.14.
Because the Torah commands it (Genesis ch.1 and ch.9).
It means to be serious about it. For Orthodox Jews, it means to keep the Torah's commands.
Yes, the Torah commands us to.See also:Jewish social laws
the 10 commandmentsAnswer:The Torah, with all its 613 commands.
For the Jews themselves:The Torah and its classical commentaries has always been the Jewish guide.For non-Jews:1) The large majority of the Torah's commands such as ritual purity, Shabbat and keeping kosher, are obligatory only for Jews.2) Non-Jews are expected to learn from the Torah's moral imperatives such as mutual respect (etc.), and worldwide traditions such as human dignity (etc).
"Progressive" implies change. Orthodox Jews are those who believe in God and the Torah, and keep the commands of the Torah (Sabbath, Kashruth, etc.).
The Torah commands Jews to study it (Deuteronomy ch.6). It reminds one of its history, events and laws; and it strengthens morals and provides attitudes, inspiration, reverence and hope.