Bhagwad Gita
Chapter 15, Verse 16
द्वाविमौ पुरुषौ लोके क्षरश्चाक्षर एव च।
क्षरः सर्वाणि भूतानि कूटस्थोऽक्षर उच्यते।।15.16।।
There are two classes of beings, the fallible and the infallible. In the material world every entity is fallible, and in the spiritual world every entity is called infallible.