Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) narrates: The Prophet (peace and blessings be upon him) kept repeating a single verse over and over until morning came.
Ahmad recorded it. Its chain contains a narrator, Isma'il bin Salm al-Naji; I have not found anyone who has written his biography.
Hadith Takhrij«مسند أحمد بن حنبل ، مسند أبى سعيد الخدرى رضى الله عنه 11387، شعب الإيمان للبيهقي، فصل فى إحضار القارء قلبه ما يقرؤه والتفكر فيه 1976 ، أخرجه مسند أحمد برقم: 27305»