One should always live in the Land of Israel, even in a city where the majority are idol worshippers, and not in chutz la Aretz, even in a city where the majority are Jews. (Kesubos 110); also included in the Rambam   (Hilchos Melachim Chapter 5)

    Said the Holy One Blessed be He: A small group in the Land of Israel is dearer to Me than a full Sanhedrin outside the Land. (Yerushalmi, Sanhedrin 86)

   There are ten measures of Torah in the world. Nine are in Eretz Israel. and one in the rest of  the world. (Esther Rabba)

Better is a dry piece of bread with tranquility in it than a house full of quarrelsome feasts (Mishle 17:1):     Better is a dry piece of bread with tranquility in it: R. Yochanan said, "This refers to Eretz Israel, for even if a person eats (dry) bread and salt every day while dwelling in Eretz Israel, he is assured a portion in the World to Come…Than a house full of quarrelsome feasts: This refers to Chutz LaAretz, which is full of violence and robbery." (Yalkut Shimoni 2:956)

Settling Eretz Israel is a Mitzvah that encompasses all the Torah, for all those who walk in it four Amot have a portion in the World to Come which is all life. (Or ha Chayim ha Kaddosh Devarim 30:20)

"It is preferable to dwell in the deserts of Eretz Israel than the palaces of Chutz LaAretz" (Bereshit Rabba 39:8).

In the beginning (Bereshit) G-d created the Heavens and the earth” (Bereshit 1:1)

Rashi comments:  "Rabbi Ytzchak said: The Torah did not need to start from Bereshit but from “This month is the first of the months for you”(Shemot 12:2) for it is the first Mitzvah that Israel was commanded. Why does the Torah start with Bereshit? Because “The strength of his acts He declared to His people TO GIVE TO THEM THE INHERITANCE OF THE NATIONS” (Tehillim 111:6) For if the nations of the world say to Israel: You are thieves for you conquered the land of seven nations,  the Jews will be able to respond to the nations of the world: The entire Land belongs to The Holy One Blessed be He”, He created it and He choose to give it to whom it seemed right in His eyes” According to His will, He gave it to the seven nations, and according to His will, He took it from them and gave it to us”

 For Zion's sake will I not hold my peace, and for Jerusalem's sake I will not rest, until her righteousness goes forth like radiance, and her salvation like a burning torch.  And the nations shall see your righteousness, and all kings your glory; and you shall be called by a new name, which the mouth of Hashem shall express. (Yeshayahu 62: 1- 2)

The side of Keddusha [Holiness] only rests in the heart of the world and this is Yerushalaim (Zohar ha Kaddosh Ki Tisa 193)

      This is what abolished our kingdom, destroyed our Beit HaMikdash, prolonged our exile, and brought us to our present predicament. Our fathers sinned and are no more.

For they found many astrology books, followed them, and went astray. They imagined that these wisdoms were glorious and greatly beneficial, and they did not study warfare and land conquest. Instead, they imagined that these wisdoms would help them. Therefore, the prophets called them fools; and they certainly were fools, for they followed vanities which cannot avail nor rescue, for they are vain.   (Iggrot U'Teshuvot LeRambam, Iggrot Shonot, p. 21. 204)

The Rambam writes as follows: (Rambam, Laws of Kings and Their Wars, 7:15) "A man should not think at the time of war of his wife, nor of his children, nor of his possessions, but he must free his heart of everything and set himself to the battle. And more - he should think that the entire existence of Israel depends on him. And if he is afraid and turns back, it is as if he spilled the blood of his comrades. And regarding this, it is written: 'Not to melt his brother's heart like his heart'... For everyone who fights with all of his heart, and with the intention to sanctify the Name of Hashem, is promised that he will not be harmed... and he will merit the life of the World To Come." (Rambam, Laws of Kings and Their Wars, 7:15)