Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: Two verses of Surah al-Ma'idah were abrogated: the verse of the sacrificial animals (hady) and the garlands (qala'id), and the other verse, "So judge between them or turn away from them" [al-Ma'idah: 42]. He said: "The Messenger of Allah (peace and blessings be upon him) had a choice in this matter; if he wished he would judge between them, and if he wished he would send them to someone else's judgement, until this verse was revealed: So judge between them by what Allah has revealed [al-Ma'idah: 48]."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11008