5.
The Discourse on Concentration at Jīvaka's Mango Grove
160.
On one occasion the Blessed One was dwelling at Rājagaha in Jīvaka's Mango Grove.
There the Blessed One addressed the monks thus:
"Monks," etc.
"Monks, develop concentration.
For a concentrated monk, monks, it becomes clear as it really is.
And what becomes clear as it really is?
It becomes clear as it really is that the eye is impermanent, it becomes clear as it really is that material forms are impermanent, it becomes clear as it really is that eye-consciousness is impermanent, it becomes clear as it really is that eye-contact is impermanent, whatever feeling arises with eye-contact as condition - whether pleasant or unpleasant or neither-unpleasant-nor-pleasant - that too it becomes clear as it really is is impermanent, etc.
It becomes clear as it really is that the tongue is impermanent, etc.
It becomes clear as it really is that the mind is impermanent, it becomes clear as it really is that mental phenomena are impermanent, etc.
Whatever feeling arises with mind-contact as condition - whether pleasant or unpleasant or neither-unpleasant-nor-pleasant - that too it becomes clear as it really is is impermanent.
Monks, develop concentration.
For a concentrated monk, monks, it becomes clear as it really is."
The fifth.