Abu Abd al-Rahman al-Sulami narrates from Sayyiduna Ali (may Allah be pleased with him) regarding this saying of Allah Almighty, "And give them from the wealth of Allah which He has given you" [Surah al-Nur: 33], that it is a quarter of the kitabah.
This is the correct version: mawquf (a statement of Ali, not attributed to the Prophet).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب المكاتب / 21668