O Allah, I love You and I love whoever loves You. — Evening Adhkar
اللَّهُمَّ إِنِّي أُحِبُّكَ وَأُحِبُّ مَنْ يُحِبُّكَ
Transliteration: Allaahumma innee uhibbuka wa uhibbu man yuhibbuk
Translation: O Allah, I love You and I love whoever loves You.
Reference: General supplication