It is narrated from Ibn Abbas (may Allah be pleased with them both) that he stood and addressed the people there, recited Surah al-Baqarah to them and explained it to them. When he reached this verse: 'If he leaves wealth, a bequest for parents and near relatives' [Surah al-Baqarah: 180], he said: This verse has been abrogated. Then he recited until he reached this verse: 'And those of you who die and leave behind wives should make a bequest for their wives: provision for a year without turning them out' [Surah al-Baqarah: 240], then he said: This verse too has been abrogated.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب العدد / 15463