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The Commentaries say (SNA.ii.476; SA.i.155) that he was an Anagami Brahma born in the Suddhavasa, there to pass a whole kappa...
I'm looking for an online resource for SNA.ii.476; SA.i.155.
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The Sutta Nipata source is Sn-A 3.10:
The relevant passage is:
Atha kho brahmā sahampatīti ko ayaṃ brahmā, kasmā ca bhagavantaṃ upasaṅkamitvā etadavocāti? Ayaṃ kassapassa bhagavato sāsane sahako nāma bhikkhu anāgāmī hutvā suddhāvāsesu uppanno, tattha naṃ ‘‘**sahampati brahmā’’ti sañjānanti.
අථ ඛො බ්රහ්මා සහම්පතීති කො අයං බ්රහ්මා, කස්මා ච භගවන්තං උපසඞ්කමිත්වා එතදවොචාති? අයං කස්සපස්ස භගවතො සාසනෙ සහකො නාම භික්ඛු අනාගාමී හුත්වා සුද්ධාවාසෙසු උප්පන්නො, තත්ථ නං ‘‘සහම්පති බ්රහ්මා’’ති සඤ්ජානන්ති.
"And then the Brahma Sahampati" - Who was this brahma? And from what [cause] did he, having approached, say this? This one, a bhikkhu named Sahaka in the sasana of the Kassapa the Blessed One, having become an anagami, arose in the Pure Abodes; there, they knew him as "Sahampati Brahma".