There are over 70 suttas in the “Sotāpatti Saṁyutta” that repeatedly state the four “measures” that one can use to determine whether one has attained the Sotapanna stage of Nibbana.
The series of suttas start with “Cakkavattirāja Sutta (SN 55.1).”
The English translation there is sufficient to get the basic idea. That first sutta starts by saying that an Emperor who controls all the countries on Earth (rājā cakkavattī) does not even come close to a Sotapanna who is free of births in the apayas.
Those suttas repeatedly state the “four possessions” of Sotapannas that make them free of the apayas.
P.S. I realized later that the English translation in the above link does not explain TWO keywords: “aveccappasāda” and “Ariyakanta sīla.”
– Those REQUIRE the comprehension of the Four Noble Truths/Tilakkhana/Paticca Samuppada.
– That is explained in the post, “Sotapatti Anga – The Four Qualities of a Sotāpanna.” See #4 there.