I swore allegiance to the Messenger of Allah ﷺ promising to hear and obey, and behave sincerely towards every Muslim. AbuZur'ah said: Whenever he sold and bought anything, he would say: What we took from you is dearer to us than what we gave you. So choose (as you like).  

بَايَعْتُ رَسُولَ اللَّهِ ﷺ عَلَى السَّمْعِ وَالطَّاعَةِ وَأَنْ أَنْصَحَ لِكُلِّ مُسْلِمٍ قَالَ وَكَانَ إِذَا بَاعَ الشَّىْءَ أَوِ اشْتَرَاهُ قَالَ أَمَا إِنَّ الَّذِي أَخَذْنَا مِنْكَ أَحَبُّ إِلَيْنَا مِمَّا أَعْطَيْنَاكَ فَاخْتَرْ  

[Machine] Ja'iru bay'atu Rasulillahi ﷺ 'ala assam'i watta'ati wa 'ala an ansaha lilkulli muslimin. Qala wa kana Ja'irun idha shtara ash-shay'a wa kana a'jaba ilayhi min thamnihi qala lisa'hibihi ta'lamanna wallahi lama akhadhna ahabbu ilayna mimmah a'taynak ka'annah yuridu bidhalika al-wafa'a.

Ja'ir pledged allegiance to the Messenger of Allah ﷺ for listening and obeying and for advising every Muslim. He said, "And Ja'ir, whenever he would buy something and found its price more pleasing to him than the price he paid, he would say to its seller, 'You should know, by Allah, that when we took [the item], it was dearer to us than what we have given you. It is as if he wanted to fulfill [his obligations] by that."  

جَرِيرٌ بَايَعْتُ رَسُولَ اللهِ ﷺ عَلَى السَّمْعِ وَالطَّاعَةِ وَعَلَى أَنْ أَنْصَحَ لِكُلِّ مُسْلِمٍ قَالَ وَكَانَ جَرِيرٌ إِذَا اشْتَرَى الشَّيْءَ وَكَانَ أَعْجَبَ إِلَيْهِ مِنْ ثَمَنِهِ قَالَ لِصَاحِبِهِ تَعْلَمَنَّ وَاللهِ لَمَا أَخَذْنَا أَحَبُّ إِلَيْنَا مِمَّا أَعْطَيْنَاكَ كَأَنَّهُ يُرِيدُ بِذَلِكَ الْوَفَاءَ  

I swore allegiance to the Messenger of Allah ﷺ promising to hear and obey, and behave sincerely towards every Muslim. AbuZur'ah said: Whenever he sold and bought anything, he would say: What we took from you is dearer to us than what we gave you. So choose (as you like). (Using translation from Abū Dāʾūd 4945)   

«بَايَعْتُ رَسُولَ اللَّهِ ﷺ عَلَى السَّمْعِ وَالطَّاعَةِ وَالنُّصْحِ لِكُلِّ مُسْلِمٍ» فَكَانَ إِذَا اشْتَرَى شَيْئًا أَوْ بَاعَهُ يَقُولُ لِصَاحِبِهِ اعْلَمْ أَنَّ مَا أَخَذْنَا مِنْكَ أَحَبُّ إِلَيْنَا مِمَّا أَعْطَيْنَاكَهُ فَاخْتَرْ