EXTRA · Parashas Vayeishev · Passuk 37:18 · not a Torah Temimah citation on this passuk
They saw him from afar, and before he came close to them they conspired to kill him.
Classical source (EXTRA side-ring): Yalkut Shimoni 141 / Midrash Tanchuma Vayeishev.
Sefaria — Yalkut Shimoni 141 / Midrash Tanchuma Vayeishev
English: “And they saw him from afar” — they said: Let us set the dogs on him.
Derash on the verse (midrash) — not a formal named middah of the 13. “From afar” is filled with the content of the conspiracy.
The plot against Yosef is formed while he is still far away; the crime is intentional, not a sudden impulse.