Which type of war requires the approval of the Sanhedrin of 71?
Milchemet mitzvah (obligatory war — seven nations, Amalek, defense) requires no court approval. Milchemet reshut (wars of expansion) requires the approval of the Sanhedrin of 71.
Question 2
What does 'Remember what Amalek did' require according to the Oral Tradition?
The Oral Tradition derives: 'Remember' = with the mouth (verbal recitation); 'do not forget' = in the heart. Both are obligatory aspects of the commandment.
Question 3
What is the status of lands conquered by Israel under royal authority with Sanhedrin approval?
Lands conquered under king and Sanhedrin are considered a 'conquest of the many' and have the same status as the original Eretz Yisrael conquered by Joshua — in all respects.
Question 4
In which circumstance is it permitted to leave Eretz Yisrael to live abroad permanently?
One may leave for Torah study, marriage, or to rescue property — and must return. Permanent settlement abroad is only permitted in extreme famine when food prices double and no livelihood is available.
Question 5
Why does the Rambam say leaving Eretz Yisrael is comparable to idol worship?
David's words in I Samuel 26:19 equate exile with being told to 'serve other gods.' The Rambam uses this to show that leaving the Land has spiritual consequences equivalent to idolatry.