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ʾinna l-muṣṣaddiqīna wa-l-muṣṣaddiqāti wa-ʾaqraḍū llāha qarḍan ḥasanan yuḍāʿafu lahum wa-lahum ʾajrun karīmun
Indeed the charitable men and women and those who lend Allah a good loan—it shall be multiplied for them, and there will be a noble reward for them.
— Ali Quli Qarai
Surah al-Hadid - Verse 18
18. Indeed, those men and women who have given Allah goodly loans, their rewards shall be increased manifold, and theirs shall be an honorable good reward.
The blessed Verse in question is saying that men and women believing in God Almighty, acknowledging the Prophetic call, and expending their possessions for Allah's Satisfaction are favored by Him and great rewards shall fall into their shares. Expending in Allah's Cause is so significant that although God Almighty is the Possessor of all things, He is so Gracious to His servants that He encourages them to expending in His Cause by saying that it is like giving Him goodly loans reflecting that in the same manner that loans will be reimbursed, expending in Allah's Cause will be returned manifold.