Muwatta Malik #94
Purity
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، عَنِ ابْنِ شِهَابٍ، عَنْ سَالِمِ بْنِ عَبْدِ اللَّهِ، أَنَّهُ قَالَ رَأَيْتُ أَبِي عَبْدَ اللَّهِ بْنَ عُمَرَ يَغْتَسِلُ ثُمَّ يَتَوَضَّأُ فَقُلْتُ لَهُ يَا أَبَتِ أَمَا يَجْزِيكَ الْغُسْلُ مِنَ الْوُضُوءِ قَالَ بَلَى وَلَكِنِّي أَحْيَانًا أَمَسُّ ذَكَرِي فَأَتَوَضَّأُ .
Yahya related from Malik from Ibn Shihab that Salim ibn Abdullah
said, "I saw my father Abdullah ibn Umar, do ghusl and then do wudu. I
said to him, 'Father, isn't ghusl enough for you?' He said, 'Of
course, but sometimes I touch my penis, so I do wudu.' "
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About Muwatta Malik
This hadith is #94 from Muwatta Malik, in the Book of Purity.