"I came to the Messenger of Allah ﷺ, during one of his 'Umrah at Marwah and said: 'O Messenger of Allah, I am a woman who buys and sells. When I want to buy something, I state a price less than I want to pay, then I raise it gradually until it reaches the price I want to pay. And when I want to sell something, I state a price more than I want, then I lower it until it reaches the price I want.' The Messenger of Allah ﷺ said: 'Do not do that, O Qailah. When you want to buy something, state the price you want, whether it is given or not. And when you want to sell something, state the price you want, whether it is given or not.'"  

أَتَيْتُ رَسُولَ اللَّهِ ﷺ فِي بَعْضِ عُمَرِهِ عِنْدَ الْمَرْوَةِ فَقُلْتُ يَا رَسُولَ اللَّهِ إِنِّي امْرَأَةٌ أَبِيعُ وَأَشْتَرِي فَإِذَا أَرَدْتُ أَنْ أَبْتَاعَ الشَّىْءَ سُمْتُ بِهِ أَقَلَّ مِمَّا أُرِيدُ ثُمَّ زِدْتُ ثُمَّ زِدْتُ حَتَّى أَبْلُغَ الَّذِي أُرِيدُ وَإِذَا أَرَدْتُ أَنْ أَبِيعَ الشَّىْءَ سُمْتُ بِهِ أَكْثَرَ مِنَ الَّذِي أُرِيدُ ثُمَّ وَضَعْتُ حَتَّى أَبْلُغَ الَّذِي أُرِيدُ فَقَالَ رَسُولُ اللَّهِ ﷺ لاَ تَفْعَلِي يَا قَيْلَةُ إِذَا أَرَدْتِ أَنْ تَبْتَاعِي شَيْئًا فَاسْتَامِي بِهِ الَّذِي تُرِيدِينَ أُعْطِيتِ أَوْ مُنِعْتِ وَقَالَ إِذَا أَرَدْتِ أَنْ تَبِيعِي شَيْئًا فَاسْتَامِي بِهِ الَّذِي تُرِيدِينَ أَعْطَيْتِ أَوْ مَنَعْتِ  

"I was with the Prophet ﷺ on a military campaign, and he said to me: 'Will you sell this camel of yours for a Dinar?' I said: 'O Messenger of Allah, it is yours when I get to Al-Madinah.' He said: 'Then sell it for two Dinar, may Allah forgive you.' And he kept increasing the price for me, saying: 'May Allah forgive you,' each time, until the amount reached twenty Dinar. When I came to Al-Madinah, I took hold of the camel's head and brought it to the Prophet ﷺ and he said: 'O Bilal, give him twenty Dinar from the spoils of war.' And he said: 'Take your camel away and go to your people with it.'"  

كُنْتُ مَعَ النَّبِيِّ ﷺ فِي غَزْوَةٍ فَقَالَ لِي أَتَبِيعُ نَاضِحَكَ هَذَا بِدِينَارٍ وَاللَّهُ يَغْفِرُ لَكَ قُلْتُ يَا رَسُولَ اللَّهِ هُوَ نَاضِحُكُمْ إِذَا أَتَيْتُ الْمَدِينَةَ قَالَ فَتَبِيعُهُ بِدِينَارَيْنِ وَاللَّهُ يَغْفِرُ لَكَ قَالَ فَمَا زَالَ يَزِيدُنِي دِينَارًا دِينَارًا وَيَقُولُ مَكَانَ كُلِّ دِينَارٍ وَاللَّهُ يَغْفِرُ لَكَ حَتَّى بَلَغَ عِشْرِينَ دِينَارًا فَلَمَّا أَتَيْتُ الْمَدِينَةَ أَخَذْتُ بِرَأْسِ النَّاضِحِ فَأَتَيْتُ بِهِ النَّبِيَّ ﷺ فَقَالَ يَا بِلاَلُ أَعْطِهِ مِنَ الْعَيْبَةِ عِشْرِينَ دِينَارًا وَقَالَ انْطَلِقْ بِنَاضِحِكَ وَاذْهَبْ بِهِ إِلَى أَهْلِكَ  

"The Messenger of Allah ﷺ forbade haggling before sunrise, and (he forbade) slaughtering animals that yield milk."  

نَهَى رَسُولُ اللَّهِ ﷺ عَنِ السَّوْمِ قَبْلَ طُلُوعِ الشَّمْسِ وَعَنْ ذَبْحِ ذَوَاتِ الدَّرِّ