וַיֹּ֨אמֶר בִּלְעָ֜ם אֶל־מַלְאַ֤ךְ יְהוָה֙ חָטָ֔אתִי כִּ֚י לֹ֣א יָדַ֔עְתִּי כִּ֥י אַתָּ֛ה נִצָּ֥ב לִקְרָאתִ֖י בַּדָּ֑רֶךְ וְעַתָּ֛ה אִם־רַ֥ע בְּעֵינֶ֖יךָ אָשׁ֥וּבָה לִּֽי׃
And Balaam said unto the angel of the LORD: ‘I have sinned; for I knew not that thou stoodest in the way against me; now therefore, if it displease thee, I will get me back.’
Read kabbalistic (mystical) interpretation of Numbers 22:34: and classical mystical sources.