سنن النسائي

It was narrated that Ka'b bin 'Ujrah said: "The Messenger of Allah (ﷺ) said: 'There are statements of remembrance following the prayer of which the one who says them will never be deprive of the reward: Glorifying Allah (SWT) thirty-three times following each prayer, and praising Him thirty-three times, and magnifying Him thirty-four times.'"