The Messenger of Allah ﷺ as saying: None of you must buy in opposition to one another ; and do not go out to meet the merchandise, (but one must wait) till it is brought down to the market.  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ لاَ يَبِعْ بَعْضُكُمْ عَلَى بَيْعِ بَعْضٍ وَلاَ تَلَقَّوُا السِّلَعَ حَتَّى يُهْبَطَ بِهَا الأَسْوَاقَ  

Do not go our to meet what is being brought (to market for sale). If anyone does so and buys some of it, the owner of merchandise has a choice (of canceling the deal) when it comes to the market. Abu 'Ali said: I heard Abu Dawud say: Sufyan said: none of you must buy in opposition to one another ; that is he says: I have a better one for ten (dirhams).  

أَنَّ النَّبِيَّ ﷺ نَهَى عَنْ تَلَقِّي الْجَلَبِ فَإِنْ تَلَقَّاهُ مُتَلَقٍّ مُشْتَرٍ فَاشْتَرَاهُ فَصَاحِبُ السِّلْعَةِ بِالْخِيَارِ إِذَا وَرَدَتِ السُّوقَ قَالَ أَبُو عَلِيٍّ سَمِعْتُ أَبَا دَاوُدَ يَقُولُ قَالَ سُفْيَانُ لاَ يَبِعْ بَعْضُكُمْ عَلَى بَيْعِ بَعْضٍ أَنْ يَقُولَ إِنَّ عِنْدِي خَيْرًا مِنْهُ بِعَشْرَةٍ