´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.'"
Related hadith on this topic
Explanation & Benefits
Hafiz Muhammad Ameen
1350. Commentary: "Is not unsuccessful." That is, however one recites, reward will certainly be attained, even if there is some negligence. Or, he will definitely enter Paradise.
Source: Sunan Nasa'i: Translation and Benefits by Shaykh Hafiz Muhammad Amin Hafizullah, Page: 1350