It is related that when Rav Yaakov Shimshon of Shpitivka zy’a was planning on moving to Eretz Yisroel in order to benefit from the holiness of the land and devote himself to Torah and avodah in a sanctified environment, he made a deal with his yeitzer hara. He said that he would only go to Eretz Yisroel if it agreed not to come with him and disturb his avodah. The Satan agreed to these terms and promised to remain in Chutz La’aretz.
When Rav Yaakov Shimshon arrived in Eretz Yisroel, he was surprised to find the Satan there. He asked, ‘Didn’t we agree that you wouldn’t come with me to the holy land?’
The Satan answered, ‘The one who you made the deal with in Chutz La’aretz was just one of my agents. Here, in Eretz Yisroel, I personally do my work by myself!’