Musnad Ahmad 32:1563

Hassan narrated to us, Hammad bin Zayd narrated to us, from Ubaydullah bin Abi Bakr, from his grandfather Anas bin 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 and took a broad-headed arrow—or broad-headed arrows, Ubaydullah was uncertain—then he walked toward him and began to stalk him. It is as if I am looking at him, intending to stab him with it."