وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ يَحْيَى بْنِ سَعِيدٍ، أَنَّهُ قَالَ لِسَالِمِ بْنِ عَبْدِ اللَّهِ مَا أَشَدَّ مَا رَأَيْتَ أَبَاكَ أَخَّرَ الْمَغْرِبَ فِي السَّفَرِ فَقَالَ سَالِمٌ غَرَبَتِ الشَّمْسُ وَنَحْنُ بِذَاتِ الْجَيْشِ فَصَلَّى الْمَغْرِبَ بِالْعَقِيقِ ‏.‏

Yahya related to me from Malik from Yahya ibn Said that he saidto Salim ibn Abdullah, "What is the latest you have seen your fatherdelay maghrib while on a journey?" and Salim replied, "One time thesun set when we were at Dhat al-Jaysh and he prayed maghrib at al-Aqiq." Translation Not Available

Book Ref: Muwatta Imam Malik Book 9 Hadith 338
Web Ref:  Muwatta Imam Malik Book 9 Hadith 10