Nafie' نافع مولى ابن عمر · The Book of Forgetfulness (In Prayer)

"Ibn Umar saw me playing with the pebbles while praying. When he finished (praying), he told me not to do that and said: 'Do what the Messenger of Allah (ﷺ) used to do.' I said: 'What did he used to do?' He said: 'When he sat during the prayer, he placed his right hand on his thigh and clenched all his fingers, and pointed with the finger that is next to the thumb, and he put his left hand on…

"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.'"