וַיֹּ֕אמֶר אַל־נָ֖א תַּעֲזֹ֣ב אֹתָ֑נוּ כִּ֣י ׀ עַל־כֵּ֣ן יָדַ֗עְתָּ חֲנֹתֵ֙נוּ֙ בַּמִּדְבָּ֔ר וְהָיִ֥יתָ לָּ֖נוּ לְעֵינָֽיִם׃
And he said: ‘Leave us not, I pray thee; forasmuch as thou knowest how we are to encamp in the wilderness, and thou shalt be to us instead of eyes.
Read Kabbalistic (mystical) interpretations of Numbers 10:31: Zohar and classical Jewish mystical sources, free online.