Indeed, the hours of the night are more effective for concurrence [of heart and tongue]1780 and more suitable for words.1781
Notes
[1780] Another accepted interpretation of the same words is "Indeed, arising at night is more difficult...," meaning that it will only be done by sincere believers and not others.
[1781] i.e., for recitation of the Qur’ān and for hearing and understanding it.
Verse 6 of Surah Al-Muzzammil (73:6), a Meccan surah, is in juz 29, on page 574 of the mushaf. Read it in Arabic with its transliteration, translations and tafsir, and listen to it recited by 74 reciters.
Listen to verse 6 of Surah Al-Muzzammil
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Tafsir of verse 6
Al-Mukhtasar
The hours of the night are more suited to the heart for recitation and more correct in speech.
Indeed, worship at night is more effective3 and more conducive to proper recitation4.
Notes
[3] Or "getting up at night is more difficult...," meaning that it can only be done by sincere believers.
[4] i.e., for reciting, hearing, and understanding of the Qur’an.
Verily, the rising by night (for Tahajjud prayer) is very hard and most potent and good for governing oneself, and most suitable for (understanding) the Word (of Allâh).
Lo! the vigil of the night is (a time) when impression is more keen and speech more certain.
Truly the rising by night is most potent for governing (the soul), and most suitable for (framing) the Word (of Prayer and Praise).
Surely the rising by night is the firmest way to tread and the best corrective of speech.
Surely (prayer) by night is more intense in performance and more upright in (devotional) oration.
Abu Hurayrah (may Allah be pleased with him) reported that the Messenger of Allah (may Allah's peace and blessings be upon him) said: "The most excellent fast after Ramadan is Allah's month, Muharram, and the most excellent prayer after what is prescribed is prayer during the night."