The Holy Quran 73:7 — Surah Al-Muzzammil
Arabic text
إِنَّ لَكَ فِى ٱلنَّهَارِ سَبْحًا طَوِيلًا
Translation
You certainly have intensive (important) work (of propagating Islaam) during the day (and will be unable to devote your attention exclusively for worship during the day. The night is therefore best for this purpose).
Tafsir (excerpt) — Tafsir Usmani
that is, during the day there is the admonishing of people and many other kinds of occupations. Although for you ﷺ these too are indirect worship, still the night-time should be reserved for the direct worship of your Sustainer and intimate supplication to Him.
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