Sahih Bukhari
Dress
Volume: 007 / Book Number: 072 / Hadith Number: 843
Narrated Salim's father:
Once Gabriel promised to visit the Prophet but he delayed and the Prophet got worried about that. At last he came out and found Gabriel and complained to him of his grief (for his delay). Gabriel said to him, "We do not enter a place in which there is a picture or a dog."