Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
quran:7:205 –

And remember your Lord within yourself in humility and in fear without being apparent in speech - in the mornings and the evenings. And do not be among the heedless.  

And remember your Lord within yourself, that is, secretly, humbly, submissively, and fearfully, in awe of Him, and, louder than ˹speaking˺ in secret, more quietly than speaking out loud, that is, a middle way between the two, at morning and evening, at the beginning of the day and at its end. And do not be among the heedless, of God’s remembrance.
القرآن:٧:٢٠٥ –

وَاذْكُرْ رَبَّكَ فِي نَفْسِكَ تَضَرُّعًا وَخِيفَةً وَدُونَ الْجَهْرِ مِنَ الْقَوْلِ بِالْغُدُوِّ وَالْآصَالِ وَلَا تَكُنْ مِنَ الْغَافِلِينَ  

{واذكر ربَّك في نفسك} أي سرا {تضرُّعا} تدللا {وخيفة} خوفا منه {و} فوق السر {دون الجهر من القول} أي قصدا بينهما {بالغدو والآصال} أوائل النهار وأواخره {ولا تكن من الغافلين} عن ذكر الله.