Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) narrates concerning this saying of Allah Almighty: (Allah Almighty says:) "And give its due on the day of its harvest." Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) said: Formerly people used to give something, apart from the obligatory charity, to whoever came to them asking for something.
Imam al-Tabarani recorded it in al-Mu'jam al-Awsat, and its narrators are thiqat (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب التفسير / 11003