The Messenger of Allah ﷺ commanded me to recite the Muawwidhat after every prayer.
حدثنا محمد بن سلمة المرادي حدثنا ابن وهب عن الليث بن سعد أن حنين بن أبي حكيم حدثه عن علي بن رباح اللخمي
أمرني رسول الله ﷺ أن أقرأ بالمعوذات دبر كل صلاة
[Its chain of transmission is hasan] Narrated by Nasai in Sahw, chapter on the command to recite the protective surahs after finishing the prayer, no. 1337, from Muhammad bin Salama. Tirmidhi graded it hasan, no. 2903, and Ibn Khuzayma graded it sahih, no. 755, and Ibn Hibban, no. 755, and Hakim, 1/253, on the criterion of Muslim, and Dhahabi agreed with him.