57:6
يُولِجُ ٱلَّيْلَ فِى ٱلنَّهَارِ وَيُولِجُ ٱلنَّهَارَ فِى ٱلَّيْلِ ۚ وَهُوَ عَلِيمٌۢ بِذَاتِ ٱلصُّدُورِ
yūliju al-layla fī l-nahāri wayūliju l-nahāra fī al-layli wahuwa ʿalīmun bidhāti l-ṣudūri
He makes night merge into day and day into night. He knows what is in every heart.
He merges night into day (i.e. the decrease in the hours of the night is added into the hours of the day), and merges day into night (i.e. the decrease in the hours of the day is added into the hours of the night), and He has full knowledge of whatsoever is in the breasts.