<div>The Kol Bo (Simman 127) quotes the Maharam MeRotenburg:</div>
<div>"The primary Mitzvah of going to EY, is... only if he will be Parush from here on, and he will be careful of all types of sins and fulfill all the Mitzvos HaTeluyos BaAretz, for if he sins he will be punished more than if he sinned in Chu"l, because Hashem seeks out EY constantly and the Eyes of Hashem are upon it and he watches it alwas, and one who rebels in the palace of the King is not the same as one who rebels outside the palace, and it is a Land which consumes its inhabitants.. for it will spit out those who transgress sins."
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<div>Radak (Yechezkel 33:25) - "How can you inherit the Land and do these acts which are not in accordance with the nature of the Land, for it cannot digest sin transgressors, as it in the Toras Kohanim at the end of Parshas Kedoshim..."
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<div>Rashbam (Ekev 11:10) - "This Land is better than Egypt for those who keep Mitzvos, and the worst of all the Lands for those who do not."</div>
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<div>Shla"h (Shaar Haosiyos 56a) - "One year after I came to Yerushalayim... was the Shemitta year... and many of those dwelling in the Land wanted to absolve themselves, because of the great duress... and I deliberated with myself and said, I am more obligated to keep it and even to sell the coat off my back, for Hashem will tell me, why have you come from a place where you are exempt to a place where you are obligated, and when you are in a place where you are obligated you will neglect this Mitzvah? Why have you come to defile My Land?... And then I found the same in Sefer Charedim... that all those who come to live in EY must be very careful about Shemittah and all the Mitzvos HaTeluyos BaAretz, just as the Amoraim were careful to keep them as it says in the Yerushalmi, so that the Mitzvah of dwelling in EY not come with an Aveirah of negating the Mitzvos HaTeluyos Bah, and the loss will outweigh the gain."
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