Sayyiduna Jarir (may Allah be pleased with him) said: I pledged allegiance to the Messenger of Allah (peace and blessings be upon him) on hearing, obeying, and sincere goodwill towards every Muslim. Whenever Jarir (may Allah be pleased with him) made a sale with someone, he would say: What we have taken from you is dearer to us than what we have given you; you have the option. His intention by this was to complete the sale.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10451