Mishkat al-Masabih 2151, 2152

Al-Irbād b. Sāriya said the Prophet (ﷺ) used to recite al-Musabbihāt* before going to sleep, and say they contained a verse which is better than a thousand verses. *These are said to be sūras 57, 59, 61, 62, 64, 87 which begin with the perfect, imperfect, or imperative of the verb sabbaha ('to glorify'). Tirmidhī and Abū Dāwūd transmitted it, and Dārimī transmitted it in mursal form on the authority of Khalid b. Ma'dān. Tirmidhī said this is a hasan gharīb tradition.