Hani bin Muawiyah (may Allah have mercy on him) says that I had the honor of performing Hajj during the time of Hazrat Uthman Ghani (may Allah be pleased with him). I was sitting in the Prophet's Mosque when a man was narrating this hadith: One day we were sitting with the Prophet (peace and blessings be upon him) when a man came and started praying behind a pillar. He prayed quickly and did not complete it properly, then left. The Prophet (peace and blessings be upon him) said: If he dies, he will die in a state where he is not established on the religion even a little. When a man shortens his prayer, he should at least complete it properly. Hani says that I asked people about the one narrating the hadith, and it was told to me that he was Hazrat Uthman bin Hunaif (may Allah be pleased with him).