Quran 7:205 Al-A'raf, ayah 205 of 206

وَٱذْكُر رَّبَّكَ فِى نَفْسِكَ تَضَرُّعًا وَخِيفَةً وَدُونَ ٱلْجَهْرِ مِنَ ٱلْقَوْلِ بِٱلْغُدُوِّ وَٱلْـَٔاصَالِ وَلَا تَكُن مِّنَ ٱلْغَـٰفِلِينَ ۝٢٠٥

7:205 And do thou (O Muhammad) remember thy Lord within thyself humbly and with awe, below thy breath, at morn and evening. And be not thou of the neglectful.