Muwatta Malik, Book 20, Hadith 913 (In-Book)

Yahya related to me from Malik from Nafi that Abdullah ibn Umar used to pray dhuhr, asr, maghrib and isha at al-Muhassab, and then enter Makka at night and do tawaf of the House.

وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ نَافِعٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، كَانَ يُصَلِّي الظُّهْرَ وَالْعَصْرَ وَالْمَغْرِبَ وَالْعِشَاءَ بِالْمُحَصَّبِ ثُمَّ يَدْخُلُ مَكَّةَ مِنَ اللَّيْلِ فَيَطُوفُ بِالْبَيْتِ ‏.‏

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also referenced under: Book 20, Hadith 216 (USC-MSA)