Zaid bin Khalid Al-Juhani narrated that: The Messenger of Allah (peace be upon him) said: “Whoever provides the food for a fasting person to break his fast with, then for him is the same reward as his (the fasting person’s), without anything being diminished from the reward of the fasting person.”
Jami` at-Tirmidhi, Book 8, Hadith 126