Muwatta Malik #213
Prayer
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."
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About Muwatta Malik
This hadith is #213 from Muwatta Malik, in the Book of Prayer. Muwatta Malik contains 1,985 hadiths across 61 books.