וַיִּרְא֥וּ אֹת֖וֹ מֵרָחֹ֑ק וּבְטֶ֙רֶם֙ יִקְרַ֣ב אֲלֵיהֶ֔ם וַיִּֽתְנַכְּל֥וּ אֹת֖וֹ לַהֲמִיתֽוֹ׃
And they saw him afar off, and before he came near unto them, they conspired against him to slay him.
Read kabbalistic (mystical) interpretation of Genesis 37:18: and classical mystical sources.