And God's anger was kindled because he went: and the angel of the LORD stood in the way as an adversary against him. Now he was riding upon his donkey, and his two servants were with him.
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George Leo Haydock
Angry. Either because he had not granted him permission to go, or he saw that Balaam was disposed to curse the Israelites, ver. 32. Septuagint, "the angel (Michael) rose up on the road to oppose him, "diaballein. Literally, "to calumniate, accuse, resist, or to be a satan. "Hence diabolus means an accuser, opponent, calumniator (St. Augustine) (Haydock)