Surah Al-Layl 92:18

ٱلَّذِى يُؤْتِى مَالَهُۥ يَتَزَكَّىٰ

[He] who gives [from] his wealth to purify himself

Translation: Saheeh International

Tafsir

he who gives his wealth to purify himself offering it as a means of self purification before God exalted be He by making this payment for the sake of God exalted be He and not for show or the sake of reputation so that he or the offering stands purified in the sight of God. …

Excerpt from Tafsir al-Jalalayn, commentary on 92:18, via Quran.com. The reader has the full commentary and 9 more tafsirs.