وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ نَافِعٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، كَانَ يُحَرِّكُ رَاحِلَتَهُ فِي بَطْنِ مُحَسِّرٍ قَدْرَ رَمْيَةٍ بِحَجَرٍ ‏.‏

Yahya related to me from Malik from Nafi that Abdullah ibn Umarused to spur on his mount in the middle of Muhassir over the distanceof a stone's throw. Translation Not Available

Book Ref: Muwatta Imam Malik Book 20 Hadith 885
Web Ref:  Muwatta Imam Malik Book 20 Hadith 186