Aḥabbaka ‘lladhī aḥbabtanī lah.
May He for Whose sake you love me, love you.
Reference:
Abu Dawud 4/333. Al-Albani graded it good in Sahih Abu Dawud 3/965.
Hisnul Muslim 200
Abu Dawud 4/333. Al-Albani graded it good in Sahih Abu Dawud 3/965.
Hisnul Muslim 200