Sahih Adab al-Mufrad

Narrated from Sayyidah Aisha (may Allah be pleased with her), she said: The Messenger of Allah (peace and blessings be upon him) said: "I know when you are angry and when you are pleased." I asked, "How do you know that?" He said: "Indeed, when you are happy, you say (when swearing an oath), 'Yes, by the Lord of Muhammad (peace and blessings be upon him),' and when you are angry, you say, 'Yes, by the Lord of Ibrahim.'" Sayyidah Aisha (may Allah be pleased with her) said: I replied, "Yes, O Messenger of Allah, it is just as you say. I only avoid mentioning your name."