Tirmidhi

Hadith Commentary:
The meaning is that Allah, the Exalted, will grant the same reward to the one who fully prepares the warrior (ghazi) as He grants to the warrior himself.
To prepare the warrior means to provide him with all necessities during the journey and to arrange all the equipment required for battle.
To become a deputy (khalifah) in his household means to take care of his children, provide them with the necessities of life, and not to betray his wife.

Hadith Commentary: Benefits and Issues: Whoever provides weapons or equipment to a person who intends to participate in jihad, since he becomes a means and intermediary for that person’s participation in jihad, he too will receive reward just like those who actually participate in jihad. Similarly, whoever fulfills the needs of a mujahid’s (combatant’s) family, or takes care of their household tasks, by acting as his deputy, relieves him from concern for his home so that he can participate in jihad with full concentration. Therefore, such a person will also receive reward. However, everyone will receive reward according to their own actions; the reward will not be equal for all.

Commentary:
Note:
(In the chain of narration, "Muhammad bin Abi Layla" is weak,
but the previous chain is authentic.)

Not every person can go to war, nor is it necessary for everyone to do so; therefore, a few people (for example: soldiers) should go to war, and the rest should provide necessities for them and for their families. In this way, all people will participate in jihad, and every person will be deserving of reward according to his intention and effort—just as nowadays people enlist in the army and defend against the enemy. The remaining citizens pay taxes for their salaries, weapons, and other necessities. In this way, the entire nation fulfills the obligation of jihad, and all are deserving of reward.

Benefits and Issues:
➊ Providing iftar (breaking the fast) for a fasting person is a great act of virtue.
➋ For providing iftar, one may offer anything according to one’s ability; it is not necessary to provide a full meal. If one does provide a full meal, there is a separate reward for that.
➌ Providing iftar is cooperation in goodness, and in every good deed, cooperation is considered participation in that goodness, even if apparently it seems minor.
➍ The reward for the one who provides iftar does not come out of the share of the fasting person. Similarly, if someone is willing to cooperate in a good deed, that cooperation should be accepted, because accepting it does not diminish the status of the one performing the deed.

Benefits and Issues:

➊ Assisting in any good deed is equal to being a participant in that good deed.

➋ Financial support in jihad is also considered jihad.

➌ When more than one person participates in a good deed, all of them receive the full reward. The reward of one is not reduced and given to another.

➍ The ability to do good is itself a favor from Allah Ta’ala, and receiving reward for it is an additional favor from Allah Ta’ala.