﴿ فَلَمَّآ أَتَىٰهَا نُودِىَ مِن شَٰطِئِ ٱلْوَادِ ٱلْأَيْمَنِ فِى ٱلْبُقْعَةِ ٱلْمُبَٰرَكَةِ مِنَ ٱلشَّجَرَةِ أَن يَٰمُوسَىٰٓ إِنِّىٓ أَنَا ٱللَّهُ رَبُّ ٱلْعَٰلَمِينَ ﴾

“But when he came close to it, a call was sounded from the right-side bank of the valley, out of the tree [burning] on blessed ground: “O Moses! Verily, I am God, the Sustainer of all the worlds!””

Please check ayah 28:32 for complete tafsir.