وَيَٰٓـَٔادَمُ ٱسْكُنْ أَنتَ وَزَوْجُكَ ٱلْجَنَّةَ فَكُلَا مِنْ حَيْثُ شِئْتُمَا وَلَا تَقْرَبَا هَٰذِهِ ٱلشَّجَرَةَ فَتَكُونَا مِنَ ٱلظَّٰلِمِينَ
2:38; 20:118.
See {68}.
This shows that every thing is lawful, except what may be forbidden as being harmful physically or spiritually.
"Forbidden tree" may also signify commandments whereby certain things were forbidden to Adam and his wife. "Good word" has been likened to "good tree" in the Qur’an (14:25) and evil word to "evil tree" (14:27).