English translation of the verse 18 surah - Not a word does he (or she) utter, but there is a

Surat Qaf Verse No. 18: Reading and listening

Translation of the verse 18 from Surah Qaf : Number of verses 45 - - page 519 - Part 26.

﴾مَّا يَلۡفِظُ مِن قَوۡلٍ إِلَّا لَدَيۡهِ رَقِيبٌ عَتِيدٞ ﴿
[ ق: 18]

Not a word does he (or she) utter, but there is a watcher by him ready (to record it).

English - Sahih International

Man does not utter any word except that with him is an observer prepared [to record].

Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(50:18) He utters not a word, but there is a vigilant watcher at hand. *21

Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

*21) That is, "On the one hand, We Our self directly know man's actions and movements, even his hidden thoughts; on the other, every man has two angels appointed over him, who are recording whatever he does and says; none of his actions or words is left unrecorded. " This means that when man is produced in the Court of Allah, Allah at that time Himself also will be knowing what each person has done in the world; besides, there will also be two witnesses who will produce documentary evidence of the person's actions and deeds. As to what will be the nature of this documentary evidence, it is difficult for us to have a precise conception of it. But from the facts that we are witnessing today, it seems certain that the voices and pictures and marks of man's actions and movements are being preserved and imprinted on every particle of the environment in which he lives and works, and each one of these can be reproduced in exactly the same form and voice so as to Leave no difference whatever between the original and its copy. Man is doing this on a very limited scale with the help of his inventions, but the angels of God neither stand in need of these machines nor are bound by any limitation. Man's own body and everything around it is their tape and their film upon which they can record every voice and every image along with its minutest and most delicate detail precisely and exactly, and can make man hear, on the Day of Resurrection, with his own ears, in his own voice, those very things which he talked in the world, and can make him see, with his own eyes, the pictures of all his misdeeds, whose genuineness he would not possibly be able to deny. Here, one should also understand that in the Court of the Hereafter Allah will not punish anybody only on the basis of His own knowledge, but will punish him after fulfilling all the requirements of justice. That is why an exhaustive record is being got prepared of every person's words and deeds in the world so that a complete proof with undeniable evidence becomes available of everyone's life-work and activity.
 

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Source : Qaf Verse 18: Man does not utter any word except that with him is an observer prepared [to record].