Invocation for someone who does good to you
جَزاكَ اللهُ خَـيْراً
198. Jazaakallaahu khayran.
May
Allah reward you with good.
Reference: At-Tirmithi
(no. 2035). See also Al-Albani, Sahih At-Tirmithi 2/200 and Sahihul-Jami'
(no. 6244).