Hadith 1265
Zaid bin Khalid Al-Juhani (May Allah be pleased with him) reported:
عن زيد بن خالد الجهني، رضي الله عنه عن النبي صلى الله عليه وسلم قال: "من فطر صائمًا، كان له مثل أجره غير أنه لا ينقص من أجر الصائم شيء" ((رواه الترمذي وقال: حديث حسن صحيح)).
The Prophet (ﷺ) 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].
In plain words
Whoever helps a fasting person break their fast gains a reward like theirs, and the faster loses nothing. Generosity here lets you share in another's worship without taking anything from them.
Reference : Riyad as-Salihin 1265 In-book reference : Book 8, Hadith 275