A Greedy nature[1]
ויען בלעם ויאמר אל-עבדי בלק אם-יתן-לי בלק מלא ביתו כסף וזהב לא אוכל לעבר את-פי יקוק אלקי לעשות קטנה או גדולה
Bilaam answered and said to the servants of Balak: “[Even] if Balak gave me the entirety of his treasury, silver and gold, I wouldn’t be able to transgress the word of Hashem, my G-d, to do something small or large”[2]
The Moabite King Balak had a plot to hire the sorcerer Bilaam to curse the Jews. Besides his occult abilities, Bilaam was a renowned non-Jewish prophet. He had direct communication with G-d. When Bilaam heard that Balak wanted his help, he responded in the negative. He stressed that even if Balak would give him all of the riches in the world, Bilaam admitted he couldn’t go against Hashem’s will. Rashi, quoting our Sages, tells us[3] that this teaches us that Bilaam had a greedy nature.