An-Nisaa 4:49

Have you not seen those who claim purity for themselves[35]? It is Allah Who purifies whom He wills, and they will not be wronged even as much as the thread on a date stone.

[35] Those are the Jews who say: “We are the children of Allah and His beloved ones!” (5:18); “The Fire will not touch us except for a limited number of days!” (2:80).

Have you not seen those who claim themselves to be pure? Rather, Allāh purifies whom He wills, and injustice is not done to them, [even] as much as a thread [inside a date seed].

49. Have you not seen those (Jews and Christians)[19] who claim sanctity for themselves. Nay, but Allâh sanctifies whom He wills, and they will not be dealt with injustice even equal to the extent of a scalish thread in the long slit of a date-stone.

[19] (V.4:49) See Tafseer Ibn Kathîr

Hast thou not seen those who praise themselves for purity? Nay, Allah purifieth whom He will, and they will not be wronged even the hair upon a date-stone.