Литература Второго Храма к Шмот 3:2

וַ֠יֵּרָא מַלְאַ֨ךְ יְהֹוָ֥ה אֵלָ֛יו בְּלַבַּת־אֵ֖שׁ מִתּ֣וֹךְ הַסְּנֶ֑ה וַיַּ֗רְא וְהִנֵּ֤ה הַסְּנֶה֙ בֹּעֵ֣ר בָּאֵ֔שׁ וְהַסְּנֶ֖ה אֵינֶ֥נּוּ אֻכָּֽל׃

И явился ему Ангел Господень в пламени огня из среды куста; и он посмотрел, и вот, куст сгорел от огня, и куст не был уничтожен.

On Flight and Finding

[161] Again, on one occasion the prophet, led on by his love of acquiring knowledge, was seeking after the causes by which the most essential occurrences in the universe are brought about; for observing all created things wasting away and coming to the birth, perishing and yet remaining, he is smitten with amazement and cries out saying, “Why is it that the bush is burning and not being consumed?” (Exod. 3:2 f.), for his thoughts are busy over the untrodden place,