It is narrated from Sayyiduna Abdur Rahman bin Awf (may Allah be pleased with him) that once the Prophet (peace and blessings of Allah be upon him) went out, and I followed behind him. The Prophet (peace and blessings of Allah be upon him) entered a garden, and there he began to pray. He performed such a long prostration that I began to fear that perhaps his soul had been taken. I moved forward to see, and the Prophet (peace and blessings of Allah be upon him) raised his head and said: "Abdur Rahman! What happened?" I mentioned my concern. Upon this, the Prophet (peace and blessings of Allah be upon him) said: "Jibreel said to me: Shall I not give you glad tidings? Allah Almighty says that whoever sends blessings upon you, I will send My mercy upon him, and whoever sends peace upon you, I will send peace upon him, that is, I will grant him safety."