Musnad Ahmad 436:5

Ishaq ibn Yusuf al-Azraq narrated to us, he said: Abd al-Aziz ibn Umar ibn Abd al-Aziz narrated to me, he said: I heard Abdullah ibn Mawhab narrating to Umar ibn Abd al-Aziz, from Tamim al-Dari, he said: The Messenger of Allah, peace and blessings of Allah be upon him, was asked about a man who accepts Islam at the hands of a man. He said: "He is the most entitled of people to his life and his death."