Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
suyuti:1444a –
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السيوطي:١٤٤٤a –

"إذا بَايَعْت فَقُلْ لا خلابةَ".  

مالك، [ط] الطيالسي [حم] أحمد ح، [م] مسلم [د] أبو داود [ن] النسائي [حب] ابن حبّان عن ابن عمر، [ت] الترمذي [ن] النسائي [هـ] ابن ماجة [ك] الحاكم في المستدرك [د] أبو داود عن أنس

See similar narrations below:

Collected by Bukhārī, Suyūṭī
bukhari:2414 – Mūsá b. Ismāʿīl > ʿAbd al-ʿAzīz b. Muslim > ʿAbdullāh b. Dīnār > Ibn ʿUmar

A man was often cheated in buying. The Prophet ﷺ said to him, "When you buy something, say (to the seller), No cheating." The man used to say so thenceforward .  

البخاري:٢٤١٤ – حَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ حَدَّثَنَا عَبْدُ الْعَزِيزِ بْنُ مُسْلِمٍ حَدَّثَنَا عَبْدُ اللَّهِ بْنُ دِينَارٍ قَالَ سَمِعْتُ ابْنَ عُمَرَ ؓ قَالَ كَانَ رَجُلٌ يُخْدَعُ فِي الْبَيْعِ فَقَالَ

لَهُ النَّبِيُّ ﷺ إِذَا بَايَعْتَ فَقُلْ لاَ خِلاَبَةَ فَكَانَ يَقُولُهُ