﴿ وَٱذْكُر رَّبَّكَ فِى نَفْسِكَ تَضَرُّعًۭا وَخِيفَةًۭ وَدُونَ ٱلْجَهْرِ مِنَ ٱلْقَوْلِ بِٱلْغُدُوِّ وَٱلْءَاصَالِ وَلَا تَكُن مِّنَ ٱلْغَٰفِلِينَ ﴾

“And bethink thyself of thy Sustainer humbly and with awe, and without raising thy voice, at morn and at evening; and do not allow thyself to be heedless.”

Please check ayah 7:206 for complete tafsir.