To someone who says "May Allah bless you"1 du'a

And may Allah bless you.

Reference:Ibn As-Sunni, p. 138, (no. 278). See also Ibn Al-Qayyim, Al-Wdbil As-Sayyib, p. 304, with checking by Basheer Muhammad ?Uyoon.Hisnul Muslim 204

وَفيكَ بارَكَ الله

Transliteration

Wafīka bārakallāh.

Translation

And may Allah bless you.