Musannaf Ibn Abi Shayba 3:4489

Waki’ narrated to us, he said: Abu Sinan Sa’id ibn Sinan narrated to us, from ‘Amr ibn Murrah, from Abu ‘Ubaydah, he said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Perform Witr, O people of the Qur’an, for Allah is Witr (One/Odd) and He loves the Witr." A Bedouin said: "What is the Messenger of Allah (peace and blessings of Allah be upon him) saying?" He (Abu ‘Ubaydah) said: "It is not for you, nor for your companions."