Musnad Ahmad 32:1599

Ishaq ibn Isa narrated to us, Hammad—meaning Ibn Zayd—narrated to us, Ubaydullah ibn Abi Bakr narrated to us, from his grandfather Anas ibn Malik: "A man peeked into one of the chambers of the Prophet, may Allah bless him and grant him peace. The Prophet, may Allah bless him and grant him peace, stood up to him with a broad-headed arrow, or broad-headed arrows. It is as if I am looking at him, stalking him in order to stab him."