Hadith: Whoever equips a fighter in the cause of Allah has indeed taken part in the fight himself; and whoever looks after the dependents of a fighter in his absence properly has indeed taken part in the fight himself

عَن زَيْدِ بْنِ خَالِدٍ رَضِيَ اللَّهُ عَنْهُ أَنَّ رَسُولَ اللَّهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ قَالَ:
«مَنْ جَهَّزَ غَازِيًا فِي سَبِيلِ اللَّهِ فَقَدْ غَزَا، وَمَنْ خَلَفَ غَازِيًا فِي سَبِيلِ اللَّهِ بِخَيْرٍ فَقَدْ غَزَا».
[صحيح] - [متفق عليه] - [صحيح البخاري: 2843]

Zayd ibn Khālid (may Allah be pleased with him) reported: The Messenger of Allah (may Allah's peace and blessings be upon him) said:
"Whoever equips a fighter in the cause of Allah has indeed taken part in the fight himself; and whoever looks after the dependents of a fighter in his absence properly has indeed taken part in the fight himself."
[Authentic hadith] - [Narrated by Bukhari & Muslim] - [Sahih Bukhari - 2843]

Explanation

The Prophet (may Allah's peace and blessings be upon him) informed that if a person equips a warrior in the cause of Allah and provides him with the means for travel and the necessary provisions, such as the weapon, mount, food, expenses, etc., he is considered to be a warrior in the cause of Allah and obtains the same reward.
And if a person takes care of the affairs of a warrior in the cause of Allah and takes his place in looking after his family during his absence, he is considered to be a warrior in the cause of Allah.