"Whoever some good was done to him, and he says: 'May Allah reward you in goodness' then he has done the most that he can of praise."
Jami` at-Tirmidhi Book 27, Hadith 141
← Previous Hadith "Whoever is given a gift, then if he finds something let him reciprocate. If he has nothing, then let him mention some praise. For whoever has mentioned some praise, then he has expressed his gratitude. And whoever refrains (from doing so) then he has committed Kufr. And whoever pretends to be satisfied by that which he was not given, he is like the one who wears a garment of falsehood."

Jami` at-Tirmidhi Book 27, Hadith 140 Next Hadith → "When Allah loves a slave, He prevents him from the world, just as one of you prevents his sick from water."

Another chain reports a similar narration.

Jami` at-Tirmidhi Book 28, Hadith 1