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This is found in the Ariya Pariyesanā Sutta, (Deva) Saṅgarava Sutta, Mahā Saccaka Sutta, etc.
Upvote:1
Main two teachers were Alara Kalama & uddaka rāmaputta, Alara Kalama taught to focus on 'nothingness' and Uddaka Ramaputta taught to enter the 'dimension of neither perception nor non-perception', also see This