Rashi on Numbers 22:5/רש"י על במדבר כ״ב:ה׳

1פתורה HE SENT TO BALAAM פתורה because he was like a money changer before whom everyone lays coins; similarly all the kings used to send him their letters, asking for his advice. However, according to the literal sense of the text, this was the name of the place (Midrash Tanchuma, Balak 4).

2ארץ בני עמו THE LAND OF THE CHILDREN OF HIS PEOPLE — of Balak's people, for he came from there, and this man (Balaam) had prophesied saying to him, “You are destined to be king”. — And if you ask: Why did the Holy One blessed be He, let his Shechina rest upon so wicked a heathen, I reply that in order that the heathen peoples should have no excuse to say, “If we had prophets, we would have changed for the better”, He raised up prophets for them. Yet they (these prophets) broke down the moral fence of the world, because at first they (the heathens) were fenced in against (they refrained from) immoral living, but this man (Balaam) counselled them to freely offer themselves to prostitution (Midrash Tanchuma, Balak 1; cf. Rashi on Numbers 24:14).

3לקרא לו TO CALL HIM — the call was for him, for his benefit; for he (Balak) fixed for him (agreed to pay him) a large sum.

4עם יצא ממצרים [THERE IS] A PEOPLE COME OUT FROM EGYPT — and if you ask: What harm does that do you?

5הנה כסה את עין הארץ BEHOLD THEY COVER THE FACE OF THE EARTH — Sihon and Og who used to protect us stood up against them, but they slew them (Midrash Tanchuma, Balak 4).

6והוא ישב ממלי AND THEY ARE STATIONED OPPOSITE ME — ממלי is written deficient in the ו (the full form is ממולי, so that it may be connected with מול “to cut off”) — they are near enough to cut me off. The word is the same as in (Psalms 118:10): “that I shall cut them off (אמילם)” (Midrash Tanchuma, Balak 4).