Hadith 195:1
Yahya ibn Adam narrated to us, he said: Sufyan narrated to us, from Abu Ishaq, from a man from Juhaynah, who said: The Prophet, peace and blessings of Allah be upon him, heard him while he was saying: "O Haram (Forbidden/Unlawful)!" So he said: "O Halal (Permissible/Lawful)!"
حدثنا يحيى بن آدم، قال: حدثنا سفيان، عن أبي إسحاق، عن رجل من جهينة، قال: سمعه النبي صلى الله عليه وسلم وهو يقول: " يا حرام " فقال: " يا حلال "