An-Nisa 4:103

Fa-itha qadaytumu assalatafathkuroo Allaha qiyaman waquAAoodanwaAAala junoobikum fa-itha itma/nantumfaaqeemoo assalata inna assalatakanat AAala almu/mineena kitaban mawqoota

And when you have completed the prayer, remember Allāh standing, sitting, or [lying] on your sides. But when you become secure, re-establish [regular] prayer. Indeed, prayer has been decreed upon the believers a decree of specified times.

Once you have finished your Salāh, then, remember Allah while standing, sitting and reclining. As soon as you are secure, perform Salāh as due. Surely, Salāh is an obligation on the believers that is tied up with time.