The Criterion - 25:62
He has made the night and the day alternate, for those who take admonition or give thanks...
The admonition we should take from the alternation of day and night:
The Stories/28:71
"Say, "What would you say if Allah made the night perpetual upon you until the Day of Resurrection? Which God besides Allah can bring you any light? Do you not hear?"
The Stories/28:72
"Say, "What would you say if Allah made the day continuous upon you until the Day of Resurrection? Which God besides Allah can bring you the night of rest? Do you not see?"
The Stories/28:73
It is of His Mercy that He arranged the night and the day, that you may rest in the one and seek His Blessings in the other. Perhaps you will be grateful.