Likutei Moharan 23:12/ליקוטי מוהר"ן כ״ג:י״ב

112. This too relates to section 4: It is explained there: By virtue of the mitzvah of mezuzah, the money’s attraction is eliminated …. Therefore, “And you shall write them on the mezuzot” parallels “You shall not covet.” Study there. Now, come and see the wonders of God. It is explained in Jerusalem Talmud, Peah: Artaban sent a beautiful pearl to Rebbi. Rebbi sent back a mezuzah (1:1; Bereishit Rabbah 35:4). On the face of it, this is surprising. Why did he send him specifically a mezuzah and not some other religious object? However, based on what Rebbe Nachman has disclosed in this lesson, the matter is well clarified: The mezuzah in particular eliminates the attraction of money. This is why he specifically sent him a mezuzah, because Artaban had sent him a beautiful pearl—namely, wealth and money. It was worth a great deal of money, which he saw as the main thing. Therefore, to counter this, Rebbe specifically sent him a mezuzah. This is because the mezuzah eliminates the attraction of wealth, as explained.