wazifa ya hayyu ya qayyum

it is a saying of Ahmad b. Taymiyya which his student Muhammad b. al-Qayyim (Allah have mercy on both of them) relates in two of his books:this wazifa Madarij al-Salikin and Tariq al-Hijratayn, in which
he says that reciting “Ya Hayyu Ya Qayyum, la ilaha illa ant” every day 40 times after praying the Sunnah of
Fajr and before the Fard “revives the heart” and “has an astonishing effect” respectively