Sayyiduna Zayd bin Khalid al-Juhani رضي الله عنه narrates this statement of the Noble Prophet صلى الله عليه وسلم: "Whoever equips a person fighting in the way of Allah or looks after his family in his absence, he will also receive a reward like that of the fighter, but the reward of the fighter will not be diminished in any way. And if someone gives iftar to a fasting person, he will also receive a reward like that of the fasting person, and the reward of the fasting person will not be diminished in any way."
Hadith Referenceصحیح ابن حبان / كتاب السير / 4633
Hadith Gradingفضيلة الشيخ الإمام محمد ناصر الدين الألبانيصحيح - انظر ما قبله.فضيلة الشيخ العلّامة شُعيب الأرناؤوطإسناده صحيح رجاله ثقات رجال الصحيح