Muwatta Malik #696
Fasting
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَحَدَّثَنِي عَنْ مَالِك أَنَّهُ بَلَغَهُ أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ كَانَ يُسْأَلُ هَلْ يَصُومُ أَحَدٌ عَنْ أَحَدٍ أَوْ يُصَلِّي أَحَدٌ عَنْ أَحَدٍ فَيَقُولُ لَا يَصُومُ أَحَدٌ عَنْ أَحَدٍ وَلَا يُصَلِّي أَحَدٌ عَنْ أَحَدٍ
Yahya related to me from Malik that he had heard that Abdullah
ibn Umar used to be asked, "an some one fast for some one else, or do
the prayer for some one else?" and he would reply, "No one can fast or
do the prayer for anyone else."
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About Muwatta Malik
This hadith is #696 from Muwatta Malik, in the Book of Fasting.