Weak
Jami' at-Tirmidhi 3580
“I heard the Messenger of Allah (ﷺ) saying; ‘Indeed, Allah, the Mighty and Sublime, says: “Indeed My worshipper who is entirely My slave is the one who remembers Me when he is about to meet his enemy.” That is: “At the time of fighting.”
إِنَّ عَبْدِي كُلَّ عَبْدِي الَّذِي يَذْكُرُنِي وَهُوَ مُلاَقٍ قِرْنَهُ " . يَعْنِي عِنْدَ الْقِتَالِ