Muwatta' Malik 3-67

Translation

Yahya related to me from Malik from Umar ibn Muhammad ibn Zayd from Salim ibn Abdullah that Abdullah ibn Umar used to say, "If you are uncertain in the prayer, estimate what you think you have forgotten of the prayer and repeat it, then do the two sajdas of forgetfulness from the sitting position."

Grades by grader

Other narrations of this report

Sahih Muslim 389gMusnad Ahmad 7694Musannaf 'Abd al-Razzaq 3491al-Sunan al-Kubra (al-Bayhaqi) 3926Musnad Abi Ya'la 5967

Narrators

1. 1
   ʿAbdullāh b. ʿUmar b. al-Khaṭṭāb

   One of the Companions who narrated most often, and one of the ʿAbādilah; he was among the people most strict in following the narrations (athar).d. 72 AH, or 73 AH, or 74 AH, also said: 75 AH
   عَبْدُ اللهِ بْنُ عُمَرَ بْنِ الْخَطَّابِأحد المكثرين من الصحابة والعبادلة ، وكان من أشد الناس اتباعا للأثر
   أن
2. 2
   Sālim b. ʿAbdullāh b. ʿUmar b. al-Khaṭṭāb

   He was reliable (thabt), devout (ʿābid) and virtuous (fāḍil); he resembled his father in conduct (hady) and demeanor (samt)d. 105 AH or 106 AH or 107 AH or 108 AH, and the correct one is the first
   سَالِمِ بْنِ عَبْدِ اللهِكان ثبتا عابدا فاضلا ، كان يشبه بأبيه في الهدي والسمت
   عن
3. 3
   ʿUmar b. Muḥammad

   trustworthy (thiqah)d. before 150 AH
   عُمَرَ بْنِ مُحَمَّدِ بْنِ زَيْدٍثقة
   عن
4. 4
   Mālik b. Anas

   The jurist (al-faqīh), the Imam of the Abode of Migration (Imām Dār al-Hijrah), the head of the proficient masters, and the foremost among the meticulous.d. 178 AH, or 179 AH
   مَالِكٌالفقيه ، إمام دار الهجرة ، رأس المتقنين ، وكبير المتثبتين

Who each narrator was and how reliable, from hdith.com

Latin names and English verdicts with a dotted underline are machine translations, not reviewed.