It is narrated from Sayyiduna Abdur Rahman bin Awf (may Allah be pleased with him), he says: The Messenger of Allah (peace and blessings be upon him) went out towards the tall date palms, entered among them, and fell into prostration facing the Qiblah. He (peace and blessings be upon him) remained in prostration for so long that I began to think that Allah Almighty had taken his soul. In any case, I sat down near him, and then the Messenger of Allah (peace and blessings be upon him) raised his head and said: Who is this? I said: Abdur Rahman. He (peace and blessings be upon him) said: What happened to you? I said: O Messenger of Allah! You performed such a long prostration that I feared Allah Almighty had caused you to pass away. He (peace and blessings be upon him) said: The matter is that Jibreel (peace be upon him) came to me and gave me this glad tidings: Allah Almighty says: Whoever prays for mercy upon you, I will send mercy upon him, and whoever sends peace upon you, I will send peace upon him. So I prostrated to Allah Almighty in gratitude.