Muwatta Malik, Book 3, Hadith 10 (USC-MSA)

Yahya related to me from Malik that Abdullah ibn Umar heard the iqama while he was in Baqi, so he increased his pace of walking to the mosque.

وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ نَافِعٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، سَمِعَ الإِقَامَةَ، وَهُوَ بِالْبَقِيعِ فَأَسْرَعَ الْمَشْىَ إِلَى الْمَسْجِدِ ‏.‏

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also referenced under: Book 3, Hadith 156 (In-Book)