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अशब्दमस्पर्शमरूपमव्ययंतथाऽरसं नित्यमगन्धवच्च यत् ।अनाद्यनन्तं महतः परं ध्रुवंनिचाय्य तन्मृत्युमुखात् प्रमुच्यते ॥ १५ (Kath. Upan. 1.3.15)   

अशब्दमस्पर्शमरूपमव्ययंतथाऽरसं नित्यमगन्धवच्च यत् ।अनाद्यनन्तं महतः परं ध्रुवंनिचाय्य तन्मृत्युमुखात् प्रमुच्यते ॥ १५ (Kath. Upan. 1.3.15)   

2nd Adhyaya 1st valli : mantras 3, 4, 5, 6, 7, 8 9 10

Meaning : That (Atma) is without (attributes) sound, touch, form or shape, without decay, nitya (eternal), taste, and smell, which is without any beginning or an end, beyond Mahat (great). One who understands this  (atmatattva) as eternal is freed from the jaws of death.<ref name=":0" /> 

2nd Adhyaya 2nd valli : mantras 1 2 4 8  

Further, many mantras (3 to 10) from the Ist Valli of 2nd Adhyaya and mantras 1,2,4,8 from the 2nd Valli of 2nd Adhyaya directly refer to the Atma tattva. In the third Valli many aspects are described such as - 

Karmagnana phala vaiphalyam

Karmagnana phala vaiphalyam