Ikrimah narrates from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that he used to say takbir from the morning of Arafah until the last of the days of Tashriq, but not at Maghrib: 'Allahu akbar, Allahu akbar, Allahu akbar, wa lillahil-hamd, Allahu akbar wa ajall, Allahu akbar ala ma hadana' (Allah is the Greatest, Allah is the Greatest, Allah is the Greatest, and to Allah belongs all praise; Allah is the Greatest and Most Majestic; Allah is the Greatest for what He has guided us to).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة العيدين / 6280