בראשית פרק כג, טז ַא לֹקְש יַובְ רָ הָם לְעֶׁפְרֹן אֶׁת-הַכֶׁסֶׁף
Efron sought money and did not know that he would come to a long-term loss. In this verse the Torah removes a letter Vav from his name. Why does the Torah allude to the loss to Efron with this letter?
The basis of belief in HaShem is to believe in the six particular manifestations of HaShem, that He rules in the four directions, above and below. Whereas, the pursuit of riches brings one to a loss of faith (for example, the spoils from the Egyptians at the Sea led to the Golden Calf). Efron in his pursuit of wealth, lost sight of belief in HaShem that rules in the six directions, and thus, lost his Vav. This is further alluded to in the name of Efron (without the Vav) has a numerical value of 400, indicating that the עין רע (also numeric value of 400) now directed him, and thus, sold the cave for 400 shekel.
Side note: the luchos were a cube, with six sides and the length and width of six t’fachim. Plus, the preferable method is for each column of the Sefer Torah to begin with the letter Vav.