O believers! If you help the cause of Allah, He will help you and establish your feet firmly.

Surah 47.Muhammad , Verse 7 (47:7)

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Surely the charitable men and the charitable women, and those who give a goodly loan to Allah,
shall be repaid manifold, and also be given a liberal reward besides it.

Surah 57.Al-Hadid, Verse 18 (57:18)

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Give generously for the cause of Allah and do not cast yourselves into destruction by your own hands.
Be charitable. Allah loves those who are charitable.

Surah 2.Al-Baqara, Verse 195 (2:195)

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The Prophet (Sallallaahu Alayhi Wasallam) said , "The one who looks after a widow or a poor person is like a Mujahid (warrior) who fights for Allah’s Cause, or like him who performs prayers all the night and fasts all the day."

Sahih Al Bukhari Vol.7 No.265 Narrated by Abu Huraira (Radiyallaahu ‘anhu)