Tafsir of Al-Hadeed 57:17

{Know that Allah gives life to the earth after its death}

It is said: This is a metaphor for the effect of dhikr (remembrance of Allah) upon hearts, signifying that He revives them just as the rain revives the earth.

{Indeed, the men who give charity and the women who give charity and [who] have loaned Allah a goodly loan - it will be multiplied for them, and they will have a noble reward.}