וַיִּשְׁמַ֥ע בָּלָ֖ק כִּ֣י בָ֣א בִלְעָ֑ם וַיֵּצֵ֨א לִקְרָאת֜וֹ אֶל־עִ֣יר מוֹאָ֗ב אֲשֶׁר֙ עַל־גְּב֣וּל אַרְנֹ֔ן אֲשֶׁ֖ר בִּקְצֵ֥ה הַגְּבֽוּל׃
A gdy usłyszał Balak, że przybywa Bileam, wyszedł naprzeciw niemu do miasta Moabickiego, położonego na granicy nad Arnonem, który na krańcu granicy.
Rashi on Numbers
וישמע בלק AND BALAK HEARD [THAT BALAAM WAS COMING] — He sent messengers to announce this to him.
Sforno on Numbers
ויצא לקראתו, in order to honour him, for Balak knew that Bileam was a very vain person, as our sages have made clear in Avot 5,18.
Or HaChaim on Numbers
ויצא לקראתו אל עיר מואב, He came to welcome him to the city of Moav. Why did the Torah have to bother to tell us where the meeting between Bileam and Balak took place? Perhaps the Torah wanted to show us that Balak did not hold Bileam in high esteem. Although Balak had heard that Bileam was on his way, he did not leave his city to prepare a welcome such as one does for highly placed visitors. He was content to await Bileam's arrival before welcoming him.