וְעַתָּ֣ה ׀ לְכ֣וּ וְנַֽהַרְגֵ֗הוּ וְנַשְׁלִכֵ֙הוּ֙ בְּאַחַ֣ד הַבֹּר֔וֹת וְאָמַ֕רְנוּ חַיָּ֥ה רָעָ֖ה אֲכָלָ֑תְהוּ וְנִרְאֶ֕ה מַה־יִּהְי֖וּ חֲלֹמֹתָֽיו׃
Come now therefore, and let us slay him, and cast him into one of the pits, and we will say: An evil beast hath devoured him; and we shall see what will become of his dreams.’
Read kabbalistic (mystical) interpretation of Genesis 37:20: and classical mystical sources.