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ʾa-lam tara ʾanna llāha yūliju l-layla fī n-nahāri wa-yūliju n-nahāra fī l-layli wa-sakhkhara sh-shamsa wa-l-qamara kullun yajrī ʾilā ʾajalin musamman wa-ʾanna llāha bi-mā taʿmalūna khabīrun
Have you not regarded that Allah makes the night pass into the day and makes the day pass into the night; and He has disposed the sun and the moon, each moving for a specified term, and that Allah is well aware of what you do?
— Ali Quli Qarai
Surah Luqman – Verse 29
29. “Have you not seen that Allah merges the night into the day and merges the day into the night, and He has made the sun and the moon subservient, each passing till an appointed time and that Allah is aware of what you do?”
The decrease and increase of the length of day and night, that occur gradually, have an important function in the life of the living creatures that need some more darkness or light for their lives. This holy verse speaks about shortening and prolonging night and day as well as the sun and the moon being made subservient by Allah. Then it refers to the movement of each of them for an appointed time; and finally it implies that Allah is aware of what all human beings do.
It says:
That is, the aim of all existence and different changes in the system of creation is man’s deed; then we must do something which contains the pleasure of Allah. Most of the verses of the Qur’an do not address only the Prophet (S), but they are sent for all people. For example, the Qur’an says:
And we know that the Prophet (S) lost his parents when he was a child and they were not alive to reach old age with him. In this verse, too, though the Prophet of Islam (S) is addressed with the Qur’anic phrase: /’alam tara/ (have you not seen), at the end of the verse it says:
this shows that the content of the verse envelops all people in general.