וַיִּשְׁלַ֨ח מַלְאָכִ֜ים אֶל־בִּלְעָ֣ם בֶּן־בְּע֗וֹר פְּ֠תוֹרָה אֲשֶׁ֧ר עַל־הַנָּהָ֛ר אֶ֥רֶץ בְּנֵי־עַמּ֖וֹ לִקְרֹא־ל֑וֹ לֵאמֹ֗ר הִ֠נֵּה עַ֣ם יָצָ֤א מִמִּצְרַ֙יִם֙ הִנֵּ֤ה כִסָּה֙ אֶת־עֵ֣ין הָאָ֔רֶץ וְה֥וּא יֹשֵׁ֖ב מִמֻּלִֽי׃
And he sent messengers unto Balaam the son of Beor, to Pethor, which is by the River, to the land of the children of his people, to call him, saying: ‘Behold, there is a people come out from Egypt; behold, they cover the face of the earth, and they abide over against me.
Read halakhic rulings (Jewish law) on Numbers 22:5: and classical halakhic sources.