Why did Gabriel refuse to enter a place where there was a picture or a dog when he had promised to visit the Prophet Muhammad (saw)?
 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."