The Messenger of Allah ﷺ said, "Whoever provides food for a fasting person to break his fast will have a reward equal to his, without diminishing the fasting person's reward in the slightest."
قال رسول الله ﷺ: من فطر صائما كان له مثل أجره، غير أنه لا ينقص من أجر الصائم شيئا.
Tirmidhi (807) and Ibn Majah (1746) narrated it, and Ibn Khuzayma (2064) and Ibn Hibban (3429) graded it sahih, all of them from the hadith of Abdul-Malik bin Abu Sulayman, who said, "Ata bin Abu Rabah narrated to me, from Zayd bin Khalid Juhani," and so he related the hadith.Imam Ahmad (17033) narrated it through this same route, and he and Ibn Khuzayma added, "Whoever equips a warrior in the path of Allah, or takes his place in caring for his family, will be credited with a reward like his, without anything being diminished from the warrior's reward." Tirmidhi said, hasan sahih. Baghawi also included it in Sharh al-Sunnah (1818) by way of Tirmidhi, transmitting his ruling that it is hasan sahih. Munziri mentioned it in Targhib wa Tarhib (1658), affirming Tirmidhi's grading of it as sahih and its inclusion by Ibn Khuzayma and Ibn Hibban in their respective Sahihs.However, Alai transmitted in Jami Tahsil (520) the statement of Ali bin Madini that Ata bin Abu Rabah did not hear from Zayd bin Khalid Juhani. Ali bin Madini was alone in making this judgment, so perhaps those mentioned earlier, who documented and narrated this hadith, did not accept Ali bin Madini's statement because of how well known this hadith is.It has also been narrated as mawquf. Nasai narrated it in Sunan al-Kubra (33332) through the route of Husayn (that is, the Teacher), from Ata, from Ayesha, who said, "Whoever feeds a fasting person to break his fast will have a reward like his, without anything being diminished from the fasting person's reward."Abdul-Razzaq (7906) narrated it from Ibn Jurayj, from Salih the freed slave of Tawama, who said, I heard Abu Hurairah say, "Whoever feeds a fasting person to break his fast, giving him food and drink, will have a reward like his."So what appears from these reports is that this hadith has a basis, for otherwise the matter of reward, and its absence, would not be something stated merely as personal opinion.On this subject there is also what was narrated from Salman Farsi in a long hadith, in which it says, "Whoever feeds a fasting person to break his fast will have his sins forgiven." Ibn Khuzayma (1887) narrated it, and it contains Ali bin Zayd bin Judan, who is daif.Taking all these hadiths and reports together, perhaps those mentioned earlier graded the hadith of Zayd bin Khalid Juhani as sahih. And Allah, the Exalted, knows best.