וַיֹּ֣אמֶר מֹשֶׁ֔ה אָסֻֽרָה־נָּ֣א וְאֶרְאֶ֔ה אֶת־הַמַּרְאֶ֥ה הַגָּדֹ֖ל הַזֶּ֑ה מַדּ֖וּעַ לֹא־יִבְעַ֥ר הַסְּנֶֽה׃
And Moses said: ‘I will turn aside now, and see this great sight, why the bush is not burnt.’
Read kabbalistic (mystical) interpretation of Exodus 3:3: and classical mystical sources.