[2/1552] al-Tahdhib: Muhammad b. Ahmad b. Yahya from Muawiya b. Hukaym from Mu’ammar b. Khallad from al-Ridha عليه السلام. He (Mu’ammar) said: I heard him (i.e. the Imam) saying:

It is incumbent on a man when he wakes up (in the morning) that he recite after the Taʿqīb (post dawn-prayer supplications) fifty verses