Behest

Be·hest

Behest

n.
  1. That which is willed or ordered; a command; a mandate; an injunction.
    To do his master's high behest.
  2. A vow; a promise. [Obs.]
    The time is come that I should send it her, if I keep the behest that I have made.
    — Paston.

Behest

v. t.
  1. To vow. [Obs.]