'Abdullah ibn Mas'ud was a poor shepherd in Makkah. One of the earliest Muslims, he stayed close to the Messenger of Allah ﷺ and learned many surahs of the Quran directly from his mouth.
❝ HadithIbn Mas'ud said: the Messenger of Allah ﷺ said to me, recite the Quran to me. I said: shall I recite it to you when it was revealed to you? He said: I love to hear it from someone else. I recited Surah an-Nisa until I reached this verse, and he said: enough. I looked, and his eyes were streaming with tears.Sahih al-Bukhari 4582 · Sahih
فَكَيۡفَ إِذَا جِئۡنَا مِن كُلِّ أُمَّةِۭ بِشَهِيدٖ وَجِئۡنَا بِكَ عَلَىٰ هَٰٓؤُلَآءِ شَهِيدٗا
“So how [will it be] when We bring from every nation a witness and We bring you, [O Muḥammad], against these [people] as a witness?”
Surah An-Nisa 4:41
Translation: Saheeh International (QuranEnc)
The verse that moved the Messenger of Allah ﷺ to tears speaks of the Day of Judgement — when every nation will have a witness, and he will be the witness over his own.