Ajahn Sunyo discusses two Itivuttaka suttas from the Khuddaka Nikaya: Iti 43: Ajata Sutta (The Not-born) and Iti 44: Nibbānadhātu Sutta (The Nibbana-element). Khuddaka Nikaya is a collection of 15 small books, one of them being Itivuttaka.
Sutta link mentioned by Venerable Sunyo: https://www.docdroid.net/thE29jY/sutta.pdf
Itivuttaka 43: Ajata Sutta (The Not-born)
https://www.accesstoinsight.org/tipitaka/kn/iti/iti.2.028-049.than.html#iti-043
https://suttacentral.net/iti43
Itivuttaka 44: Nibbānadhātu Sutta (The Nibbana-element)
https://www.accesstoinsight.org/tipitaka/kn/iti/iti.2.028-049.than.html#iti-044
https://suttacentral.net/iti44
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