Exodus Chapter 3, Verse 2
From BibleWiki
2: And the angel of the LORD appeared unto him in a flame of fire
out of the midst of a bush: and he looked, and, behold, the
bush burned with fire, and the bush was not consumed.
2: And an angel of the Lord appeared to him in flaming fire out of the bush, and he sees that the bush burns with fire,-- but the bush was not consumed.
Here, at Horeb, God appeared to Moses as the Angel of the Lord "in a flame of fire out of the midst of the thorn-bush" (סנה, βάτος, rubus), which burned in the fire and was not consumed. אכּל, in combination with איננּוּ, must be a participle for מאכּל.
