Surah Qaf (ق) (Ayah 18)

Every Utterance of Man is recorded

مَّا يَلْفِظُ مِن قَوْلٍ إِلَّا لَدَيْهِ رَ‌قِيبٌ عَتِيدٌ (Not a single word is uttered by one, but there is a watcher near him, ready [ to record ]...Qaf 50:18 ^⧉ ) In other words, there is always a supervising angel [ the scribe ] whose responsibility is to record any word that the human utters or speaks. Sayyidna Hasan Basri and Qatadah رحمۃ اللہ علیہما said that this angel records every single word - whether or not it is sinful or reward-able. Ibn ` Abbas ؓ said that only those utterances are recorded that are sinful or rewardable. Ibn Kathir, having quoted both these views, preferred the first view on the basis of the general words of the verse that every utterance is recorded. According to another narration of Sayyidna Abu Talhah ؓ from Ibn ` Abbas ؓ both the views can be accommodated. This narration states that in the first instance every utterance is recorded, whether or not it is sinful or rewardable. Once a week on Thursdays, the angels review the recorded utterances and retain only those that are sinful or rewardable, good or bad; the rest are discounted. Thus the Qur'an says: يَمْحُو اللَّـهُ مَا يَشَاءُ وَيُثْبِتُ "Allah wipes off what He wills and affirms (what He wills). And with Him is the Mother Book." (Ar-Ra` d (39) )

Imam Ahmad (رح) has reported from Sayyidna Bilal Ibn Harith Al-Muzani ؓ that the Messenger of Allah ﷺ has said:

"Verily, a man sometime utters a good word that pleases Allah, unaware of how highly it will be rewarded, and on its account Allah decrees His pleasure of him until the Day he meets Him. Similarly, a man might utter a word that angers Allah, unaware of how dreadful its punishment will be, and on its account Allah decrees for him His anger until the Day he meets Him."

Sayyidna ` Alqamah ؓ ، after narrating this from Bilal Ibn Harith ؓ ، used to say: "How many words did I not utter because of this hadith." (Ibn Kathir)