Musannaf Ibn Abi Shayba 3:6197

Waki' narrated to us, he said: Mis'ar and Sufyan narrated to us, from 'Ali ibn Badhima, from Abu 'Ubayda, he said: 'Abdullah said: "Whoever recites the Qur'an in less than three [days] is a reciter of rajaz (i.e., he recites it hastily like poetry)."