Surah At-Taubah, Ayat 88-89

Ayat 88. But the Messenger (Muhammad  [SAWW](PBUH) and those who believed with him (in Islamic Monotheism) strove hard and fought with their wealth and their lives (in Allâh's Cause). Such are they for whom are the good things, and it is they who will be successful.

Ayat 89. For them Allah has got ready Gardens (Paradise) under which rivers flow, to dwell therein forever. That is the supreme success.

Hazrat Zaid bin Khalid (May Allah be pleased with him) reported: The Messenger of Allah  [SAWW](PBUH) said, "He who equips a Ghazi (fighter) in the way of Allah is as if he has taken part in the fighting himself; and he who looks after the dependants of a Ghazi in his absence, is as if he has taken part in the fighting himself.''[Al-Bukhari Hadith #2843]. 

Lesson : as mentioned above in Surah At-Taubah Ayat 88. those who believed with him (in Islamic Monotheism) strove hard and fought with their wealth and their lives (in Allah's Cause). This Hadith tells us about the mutual help of the Muslims and the reward of their cooperation with one another. To provide the needs of Jihad of a Mujahid and to arrange for the protection, supervision and requirements of the family of a Mujahid during his absence from home due to Jihad is as good as participation in Jihad. Those who help the Mujahid in this manner will have the same reward to which the Mujahid is entitled.