References – AN 3.12: To be Remembered 
“In what cases, if any, is it useful to try to assess whether stream entry has occurred? Or is this question best left aside?” Answered by Ajahn Pasanno. [Stream entry] // [Proliferation]
Sutta: AN 3.12: The place where one attains stream entry is never forgotten.
Suttas: SN 55.1, SN 55.42: Stream entry described in terms of faith in the Three Refuges, virtue, and generosity. [Three Refuges] [Faith] [Virtue] [Generosity]
2014 Thanksgiving Monastic Retreat, Session 1, Excerpt 1
“Sometimes in the suttas people are aware that the eye of Dhamma has opened and they are now stream enterers. From my experience, sometimes people think they are sotāpanna but are not. What is the experience [of entering the stream]?” Answered by Ajahn Pasanno. [Stream entry] // [Thai Forest Tradition] [Suffering]
Reference: The Island by Ajahn Pasanno and Ajahn Amaro Chapters 16–19.
Story: “Better than being a dog.” [Ajahn Chah] [Fierce/direct teaching] [Aversion]
Follow-up: “Is it normal for a stream enter to know that he’s a stream enterer?”
Sutta: AN 3.12: One never forgets the place of stream entry.