This is a very great verse. Abdullah Ibn Massuud (may Allah be pleased with him) had a very tender voice, the Prophet (saws) used to say:

“Whoever would like to recite the Qur’an as fresh as when it was revealed, let him recite it like Ibn Umm ‘Abd.'”[1]

Abdullah Ibn Massuud narrated: Once a time the Prophet (saws) said to me:

“Recite me the Qur’an”.

I said: “O’ Messenger of Allah, (how) should I recite to you whereas it has been sent down to you?” The Prophet (saws) said:

“I desire to hear it from someone else.”

So, I recited Surat al-Nisa’ till reached the verse:

(So how [will it be] when We bring from every nation a witness and we bring you, [O Muhammad] against these [people] as a witness?)

I lifted my head or a person touched me in my side, and so I lifted my head and saw his tears falling (from the Holy Prophet’s eyes).[2]

(… فَكَيْفَ إِذَا جِئْنَا مِن كُلِّ أُمَّةٍ بِشَهِيدٍ ) (So how [will it be] when We bring from every nation a witness …): The witness of a nation is its messenger, all the messengers in addition to their nations are brought in the day of judgment.  

( وَجِئْنَا بِكَ عَلَىٰ هَٰؤُلَاءِ شَهِيدًا … ) (…and we bring you, [O Muhammad] against these [people] as a witness?): The Prophet (saws), the witness, has cried when heard this verse, what about us, the witnessed upon?

[1] Sahih Ibn Hayyan, Book of History, Chapter of what the Prophet (saws) has said about the virtues of his companions, Hadith No. 7067.

[2] Sahih Muslim, Book of Traveler’s prayer, Chapter: The virtue of listening to the Qur’an, asking one who has memorized it to recite so that one may listen, weeping when reciting, and pondering the meanings, Hadith No. 800.