أَخْبَرَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ، قَالَ قُلْتُ لأَبِي أُسَامَةَ أَحَدَّثَكُمْ عُبَيْدُ اللَّهِ عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ قَالَ نَهَى رَسُولُ اللَّهِ صلى الله عليه وسلم عَنْ تَلَقِّي الْجَلَبِ حَتَّى يَدْخُلَ بِهَا السُّوقَ فَأَقَرَّ بِهِ أَبُو أُسَامَةَ وَقَالَ نَعَمْ ‏.‏

It was narrated that Ibn 'Umar said: "The Messenger of Allah (PBUH) forbade meeting traders on the way, until one enters the market with them?" Abu Usamah acknowledged it and said: Yes. Translation Not Available

Book Ref: Sunan An Nisai Book 44 Hadith 4499
Web Ref:  Sunan An Nisai Vol 1 Book 8 Hadith 4503

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