References – SN 55.42: Overflowing Merit (2nd) 
“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 fogotten.
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]