Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
quran:57:18 –

Indeed, the men who practice charity and the women who practice charity and ˹they who˺ have loaned Allah a goodly loan - it will be multiplied for them, and they will have a noble reward.  

Indeed men who give voluntary alms (al-mussaddiqīna, derives from the ˹infinitive˺ al-tasadduq, ‘to give voluntary alms’; the tā’ ˹of the original mutasaddiqīna˺ has been assimilated with the sād) and women who give voluntary alms (a variant reading for both has the softened form ˹with a single sād, musaddiqīna and musaddiqāti˺, which derives from al-tasdīq, ‘to affirm the truth of’, ‘to believe in’) and ˹those of them˺ who have lent God a goodly loan (this refers back to both the men and women with ˹the masculine plural of˺ predominance; the supplementing of a verb ˹aqradū, ‘who lent’˺ to a noun ˹of action, al-mussaddiqāt˺ at ˹the point of˺ the relative clause of the al-, is because in that position it ˹the noun˺ functions as a verb; the mention of the ‘loan’ together with its qualification ˹‘goodly’˺ after ˹the mention of˺ ‘the giving of voluntary alms’ is intended to define it), it will be multiplied (yudā‘afu, is also read as yuda‘‘afu), namely, their loan ˹will multiplied˺, for them and they will have a generous reward.
القرآن:٥٧:١٨ –

إِنَّ الْمُصَّدِّقِينَ وَالْمُصَّدِّقَاتِ وَأَقْرَضُوا اللَّهَ قَرْضًا حَسَنًا يُضَاعَفُ لَهُمْ وَلَهُمْ أَجْرٌ كَرِيمٌ  

{إن المصَّدقين} من التصديق أدغمت التاء في الصاد، أي الذين تصدقوا {والمصَّدقات} اللاتي تصدقن وفي قراءة بتخفيف الصاد فيهما من التصديق والإيمان {وأقرضوا الله قرضا حسنا} راجع إلى الذكور والإناث بالتغليب وعطف الفعل على الاسم في صلة أل لأنه فيها حل محل الفعل، وذكر القرض بوصفه بعد التصدق تقييد له {يضاعف} وفي قراءة يضعف بالتشديد، أي قرضهم {لهم ولهم أجر كريم}.