Sayyiduna Abu Jabirah bin al-Dahhak (may Allah be pleased with him) said: The Ansar used to give charity and give as much as Allah willed. Then a year of drought struck them, so they held back from giving charity. Then Allah revealed this verse: "And do not throw yourselves with your own hands into destruction" [Surah al-Baqarah: 195].
Hadith Referenceالمعجم الكبير للطبراني / مسند من يعرف بالكنى / 19173