Musannaf Ibn Abi Shayba 27:605

Waki’ narrated to us, he said: Sufyan narrated to us, from Abu Ishaq, from Hani’ ibn Hani’, from Ali, who said: We were sitting with the Prophet, may Allah bless him and grant him peace, and Ammar came seeking permission [to enter]. He said: "Give him permission." "Welcome to the pure, the purified."