Muwatta Malik, Book 20, Hadith 30 (USC-MSA)

Yahya related to me from Malik from Musa ibn Uqba that Salim ibn Abdullah heard his father say, "Your claim that the Messenger of Allah, may Allah bless him and grant him peace, entered ihram from this desert of yours is not true, because he only entered ihram from the mosque, i.e. the mosque of Dhu'l-Hulayfa."

وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ مُوسَى بْنِ عُقْبَةَ، عَنْ سَالِمِ بْنِ عَبْدِ اللَّهِ، أَنَّهُ سَمِعَ أَبَاهُ، يَقُولُ بَيْدَاؤُكُمْ هَذِهِ الَّتِي تَكْذِبُونَ عَلَى رَسُولِ اللَّهِ صلى الله عليه وسلم فِيهَا مَا أَهَلَّ رَسُولُ اللَّهِ صلى الله عليه وسلم إِلاَّ مِنْ عِنْدِ الْمَسْجِدِ يَعْنِي مَسْجِدَ ذِي الْحُلَيْفَةِ ‏.‏

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also referenced under: Book 20, Hadith 738 (In-Book)