The word(s) "ascertain" appears 2 time(s) in 2 verse(s) in Quran in Muhammad Pickthal translation.

(1) But then, if it is afterwards ascertained that both of them merit (the suspicion of) sin, let two others take their place of those nearly concerned, and let them swear by Allah, (saying): Verily our testimony is truer than their testimony and we have not transgressed (the bounds of duty), for them indeed we should be of the evil-doers.

(2) Go, O my sons, and ascertain concerning Joseph and his brother, and despair not of the Spirit of Allah. Lo! none despaireth of the Spirit of Allah save disbelieving folk.