Sayyiduna Jabir (may Allah be pleased with him) says that the Prophet (peace and blessings be upon him) used to say takbir from after the morning prayer on the day of Arafah until the Asr prayer on the last of the days of Tashriq.
Amr bin Shamir and Jabir al-Ju'fi are not used as proof, and the narration of the trustworthy narrators suffices.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة العيدين / 6278