مَثَلُ الَّذِي يَذْكُرُ رَبَّهُ وَالَّذِي لَا يَذْكُرُ، مَثَلُ الْحَيِّ وَالْمَيِّتِ (Bukhari and Muslim)
Translation: The one who remembers his Lord and the one who does not are like the living and the dead.
مَثَلُ — likeness; يَذْكُرُ — remembers; الْحَيِّ — living; الْمَيِّتِ — dead.
Brief grammar: الَّذِي is a relative pronoun, explained by يَذْكُرُ رَبَّهُ. In لَا يَذْكُرُ, لَا negates a present-tense verb.
A heart engaged in remembering Allah remains aware of its purpose and responsibilities. Habitual neglect weakens this inner, spiritual attentiveness.