وَعَنْ اِبْنِ عَبَّاسٍ رَضِيَ اَللَّهُ عَنْهُمَا
قَالَ: «وَهَبَ رَجُلٌ لِرَسُولِ اَللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ نَاقَةً، فَأَثَابَهُ عَلَيْهَا، فَقَالَ: «رَضِيتَ«? قَالَ: لَا. فَزَادَهُ، فَقَالَ: «رَضِيتَ«? قَالَ: لَا. فَزَادَهُ. قَالَ: «رَضِيتَ«? قَالَ: نَعَمْ». رَوَاهُ أَحْمَدُ، وَصَحَّحَهُ اِبْنُ حِبَّانَ 11 صحيح
A man gave away a she-camel to the Messenger of Allah (sallallahu alayhi wa sallam). So he gave him something in return for it and asked, “Are you pleased?” He replied, “No.” So he gave him more and asked, “Are you pleased?” He replied, “No.” Again he gave him more and asked, “Are you pleased?” He replied, “Yes.”.
Bulugh al-Maram 1079, Book 7, Business Transactions, Hadith 190. 1 min read