TgO Deut15:9 :אִסתַמַר לָך דִלמָא יְהֵי פִתגָמָא עִם לִיבָך בִרשַע‏ : take care lest you get an idea in your mind in an evil direction
See the entire entry for ršāˁ, ršāˁā v.n. evil