Maliks Muwatta Book 20, Hadith Number 33.
Section : How to Enter Ihram.
Yahya related to me from Malik that he had heard that Abd al-Malik ibn Marwan had started to do talbiya at the mosque of Dhu’l-Hulayfa, after the animal he was riding on had stood up, and that Aban ibn Uthman had told him to do this.