These lines are attributed to Imām Shāfiýī rađiyallāhu ánhū:

a tah’za-u bi’d duáāyi wa tazdarīhi
wa mā tadrī bimā şaná’d duáā-u?

sihāmu’l layli lā tukhţī walākin
lahā amadun wa li’l amadi’nqiđā-u

fa yumsikuhā idhā mā shā’a rabbī
wa yursiluhā idhā nafadha’l qađā-u

 

Do you consider prayer lightly, and so abandon it?
Do you not know [of its power] and what prayer can do?

The arrows of the night shall not fail, but
They have a time to strike their target

My Lord retains [the answer to prayers] as long as He wishes
And sends it when the time comes for His decree to happen

[Dīwān ash-Shāfiýī p.114; Al-Mustaţraf 1/236; Minhāju’l Yaqīn 242]