Musnad Ahmad 33:905

Ya'qub narrated to us, my father narrated to us, from Ibn Ishaq, Yazid ibn Abi Habib al-Masri narrated to me, from Khalid ibn Abi 'Imran, from Abu 'Ayyash, from Jabir ibn 'Abdullah al-Ansari, that the Messenger of Allah (may Allah bless him and grant him peace) slaughtered two rams on the day of the 'Eid. Then, when he turned them [towards the Qibla], he said: "I have turned my face toward He who created the heavens and the earth, inclining toward truth, and I am not of the polytheists. Indeed, my prayer, my rites of sacrifice, my living and my dying are for Allah, Lord of the worlds. No partner has He. And of this I have been commanded, and I am the first of the Muslims." "In the name of Allah, and Allah is the Greatest. O Allah, it is from You and for You, on behalf of Muhammad and his nation."