﴿ ٱلَّذِينَ يَذْكُرُونَ ٱللَّهَ قِيَٰمًۭا وَقُعُودًۭا وَعَلَىٰ جُنُوبِهِمْ وَيَتَفَكَّرُونَ فِى خَلْقِ ٱلسَّمَٰوَٰتِ وَٱلْأَرْضِ رَبَّنَا مَا خَلَقْتَ هَٰذَا بَٰطِلًۭا سُبْحَٰنَكَ فَقِنَا عَذَابَ ٱلنَّارِ ﴾

“[and] who remember God when they stand, and when they sit, and when they lie down to sleep, and [thus] reflect on the creation of the heavens and the earth: "O our Sustainer! Thou hast not created [aught of] this without meaning and purpose. Limitless art Thou in Thy glory! Keep us safe, then, from suffering through fire!”

Please check ayah 3:194 for complete tafsir.