200
Reply to one who says, "I love you for the sake of Allah":
أَحَبَّكَ الَّذِي أَحْبَبْتَنِي لَهُ
Ahabbakal-ladhi ahbabtani lah
May He for whose sake you love me love you.
Source Sunan Abī Dāwūd 5125 Ḥasan
Compiler cites Abū Dāwūd 4/333; see al-Albānī, Ṣaḥīḥ Abī Dāwūd 3/965 (ṣaḥīḥ)