How sound is the hadith: "Halimah, may Allah be pleased with her, said: 'The Messenger of Allah was absent from me that day. As evening approached, we went out to meet him on the road. Behold, he came, with lights preceding him, and the sheep gathered around him. Among the sheep was a ewe whose leg Hamzah, his brother, had broken. She began to cling to him as if complaining to him. He then took hold of her leg with his noble hand, and it was as if no pain had occurred.' Then she said to her son Hamzah: 'How did you find your القرشي (Qurayshi) brother?' He replied: 'O mother, he did not pass by a stone, nor a tree, nor a plain, nor a mountain, nor a wild animal, nor a bird, except that it said: 'Peace be upon you, O Messenger of Allah.' Nor did he step on a place except that grass grew there'"?