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Not-self (Anatta) is a teaching which is difficult even to understand by an advanced practitioner. Anatta Lakhana Sutta is the direct teaching of this doctrine. https://www.accesstoinsight.org/tipitaka/sn/sn22/sn22.059.mend.html
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You might want to read :
SN 12:15 • Kaccanagotta https://www.dhammatalks.org/suttas/SN/SN12_15.html https://suttacentral.net/sn12.15/en/bodhi
MN 72 • Aggi-vacchagotta Sutta https://www.dhammatalks.org/suttas/MN/MN72.html
MN 109 • Mahā Puṇṇama Sutta https://www.dhammatalks.org/suttas/MN/MN109.html
“He assumes feeling to be the self, or the self as possessing feeling, or feeling as in the self, or the self as in feeling. He assumes perception to be the self, or the self as possessing perception, or perception as in the self, or the self as in perception. He assumes fabrications to be the self, or the self as possessing fabrications, or fabrications as in the self, or the self as in fabrications. He assumes consciousness to be the self, or the self as possessing consciousness, or consciousness as in the self, or the self as in consciousness.
“This, monk, is how self-identification view comes about.”
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It's in the The Questions of King Milinda, in the section which contains the analogy (or parable) of the Chariot.
Then, what is this "Nagasena"? Are perhaps the hairs of the head "Nagasena?"
"No, Great King!"
"Or perhaps the nails, [etc.]
The questions, the Milinda Panha, is in the Khuddaka Nikaya.
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Buddha gave advice to his son Rahula regarding this in Sutta 62, verse 8 and verse 3 here:-
http://buddhadust.net/dhamma-vinaya/wp/mn/mn.062.ntbb.wp.htm
For matter :-
Rahula, whatever internally, belonging to oneself, is solid, solidified, and clung-to, that is, head-hairs, body-hairs, nails, teeth, skin, flesh, sinews, bones, bone-marrow, kidneys, heart, liver, diaphragm, spleen, lungs, large intestines, small intestines, contents of the stomach, feces, or whatever else internally, belonging to oneself, is solid, solidified, and clung-to: this is called the internal earth element. Now both the internal earth element and the external earth element are simply earth element. And that should be seen as it actually is with proper wisdom thus: “This is not mine, this I am not, this is not my self.” When one sees it thus as it actually is with proper wisdom, one becomes disenchanted with the earth element and makes the mind dispassionate towards the earth element.
For non matter :-
Then the Blessed One looked back and addressed the venerable Rāhula thus:[641] "Rāhula, any kind of material form whatever, whether past, future, or present, internal or external, gross or subtle, inferior or superior, far or near, all material form should be seen as it actually is with proper wisdom thus: 'This is not mine, this I am not, this is not my self."' "Only material form, Blessed One? Only material form, Sublime One?" "Material form, Rāhula, and feeling, perception, formations, and consciousness.