Sünen en-Nesâî #5010

مَثَلُ الَّذِي يَذْكُرُ رَبَّهُ وَالَّذِي لاَ يَذْكُرُ رَبَّهُ مَثَلُ الْحَيِّ وَالْمَيِّتِ

The Prophet (ﷺ) said: 'The similitude of the one who remembers his Lord and the one who does not remember his Lord is like that of the living and the dead.'