Al-Aswad reports that Sayyiduna Ibn Mas'ud (may Allah be pleased with him) used to say the takbir from the Fajr prayer on the Day of Arafah until the Asr prayer on the Day of Sacrifice (the 10th of Dhul-Hijjah).
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 9500