Aitareyabrahmana 6.5

6.5

They make a corresponding verse for the stotriya at the morning pressing; thereby they make day correspond to day; by means of the lower day they take hold of the higher day. But it is not so at midday. The pṛṣṭha stotras are prosperity; they would not stand firm for him if they were to make a corresponding verse for the stotriya. By that same distinction, they do not make a corresponding verse for the stotriya at the third pressing.