Sforno on Numbers 24:1/ספורנו על במדבר כ״ד:א׳

1לקראת נחשים, he stopped trying to divine the precise hour when a curse could stick to the Israelites, seeing that by no he had realised that it pleased G’d to bless the Jewish people. There was no hope that any curse could become effective.

2וישא אל המדבר פניו, to bestow limited blessings on them, blessings which contained potential harm for the nation if it did not live up to the premise underlying the blessings. Our sages (Taanit 20) have illustrated this point when they said “the curse of the prophet Achiyah from Shiloh was easier to live with than having to live with Bileam’s blessings.”