Zaid bin Khalid Al-Juhani (RadhiAllaho anho) reported:
The Prophet (Sallallahu Alaihi Wasallam) said,
"He who provides a fasting person something
with which to break his fast,
will earn the same reward
as the one who was observing the fast,
without diminishing in any way the reward of the latter.''
[At-Tirmidhi].