Muwatta Malik #409
Shortening the Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ نَافِعٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، كَانَ يَقُولُ إِذَا لَمْ يَسْتَطِعِ الْمَرِيضُ السُّجُودَ أَوْمَأَ بِرَأْسِهِ إِيمَاءً وَلَمْ يَرْفَعْ إِلَى جَبْهَتِهِ شَيْئًا .
Yahya related to me from Malik from Nafi that Abdullah ibn Umar
used to say, "When a sick man is unable to prostrate he should motion
with his head, and not raise anything to his forehead."
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About Muwatta Malik
This hadith is #409 from Muwatta Malik, in the Book of Shortening the Prayer.