Al Furqan Ayah 62
وَهُوَ ٱلَّذِى جَعَلَ ٱلَّيْلَ وَٱلنَّهَارَ خِلْفَةً لِّمَنْ أَرَادَ أَن يَذَّكَّرَ أَوْ أَرَادَ شُكُورًا ٦٢
And He is the One Who causes the day and the night to alternate, ?as a sign? for whoever desires to be mindful or to be grateful.