Muwatta Malik #199
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 صَدَقَةَ بْنِ يَسَارٍ، عَنِ الْمُغِيرَةِ بْنِ حَكِيمٍ، أَنَّهُ رَأَى عَبْدَ اللَّهِ بْنَ عُمَرَ يَرْجِعُ فِي سَجْدَتَيْنِ فِي الصَّلاَةِ عَلَى صُدُورِ قَدَمَيْهِ فَلَمَّا انْصَرَفَ ذَكَرَ لَهُ ذَلِكَ فَقَالَ إِنَّهَا لَيْسَتْ سُنَّةَ الصَّلاَةِ وَإِنَّمَا أَفْعَلُ هَذَا مِنْ أَجْلِ أَنِّي أَشْتَكِي .
Yahya related to me from Malik from Sadaqa ibn Yasar that al-
Mughira ibn Hakim saw Abdullah ibn Umar sit back from the two sajdas
of the prayer onto the top of his feet. When he had finished, al-
Mughira mentioned it to him, and Abdullah ibn Umar explained, "It is
not a sunna of the prayer. I do it because I am ill."
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About Muwatta Malik
This hadith is #199 from Muwatta Malik, in the Book of Prayer.