וְאִם־כֹּ֨ה יֹאמְר֜וּ עֲל֤וּ עָלֵ֙ינוּ֙ וְעָלִ֔ינוּ כִּֽי־נְתָנָ֥ם יְהוָ֖ה בְּיָדֵ֑נוּ וְזֶה־לָּ֖נוּ הָאֽוֹת׃
Но если они скажут так: подойди к нам; тогда мы пойдем вверх; ибо Господь предал их в руки наши; и это будет нам знаком.'
Rashi on I Samuel
But if they say [to us], 'Come up to us.' A fear inspired by the Holy One, Blessed is He, is in their heart and they are afraid to move from their place.4Although there is a prohibition against resorting to omens in Vayikra 19:26, Tosfos in Maseches Chulin 95b explains that Yonoson himself did not believe in the sign, he only made it to encourage his weapon bearer. See Radak.