Hadithcore
Riyad as-Salihin, 235

Abu Hurairah (May Allah bepleased with him) reported:

Messenger of Allah (ﷺ) said, "Do not envy one another; do not inflate prices by overbidding against one another; do not hate one another; do not harbour malice against one another; and do not enter into commercial transaction when others have entered into that (transaction); but be you, O slaves of Allah, as brothers. A Muslim is the brother of another Muslim; he neither oppresses him nor does he look down upon him, nor does he humiliate him. Piety is here, (and he pointed to his chest three times). It is enough evil for a Muslim to hold his brother Muslim in contempt. All things of a Muslim are inviolable for his brother-in-faith: his blood, his property and his honour". <b>[Muslim]</b>.

وعنه قال‏:‏ قال رسول الله صلى الله عليه وسلم لا تحاسدوا، ولا تناجشوا، ولا تباغضوا، ولا تدابروا ولا يبع بعضكم على بيع بعض، وكونوا عباد الله إخوانًا‏.‏ المسلم أخو المسلم‏:‏ لا يظلمه ولا يحقره، ولا يخذله‏.‏ التقوى ههنا- ويشير إلى صدره ثلاث مرات- بحسب امرئ من الشر أن يحقر أخاه المسلم كل المسلم على المسلم حرام دمه وماله وعرضه” ‏(‏‏(‏رواه مسلم‏)‏‏)‏‏.‏

References1 variant
In-Book Reference
Introduction, Hadith 235
Sharh · explanationclick to expand
<b>Guidance from the Hadith:</b><br> 1) Overbidding in transactions is prohibited because it is based upon cheating, fraud, and harm.<br> 2) It is prohibited for Muslims to forsake one another for a worldly attainment, because it leads to severance of relations between them.<br> 3) The pious are the most honorable in the Sight of Allah.<br> 4) Extending harm to a Muslim in any form, verbally or physically, is prohibited.<br> <br> <b>Benefit:</b><br> Envy is one of the gravest faults and heart diseases; it incurs upon the envier five harms:<br> 1- It invalidates one’s deeds of obedience, because the envier will come on the Day of Judgment bankrupt of deeds, as the fire of envy he ignited in his heart was fueled by his good deeds.<br> 2- Committing disobedience and evildoing, because the envier has three signs: flattering those who are present, backbiting those who are absent, and gloating over other’s calamities.<br> 3- Exhausting and troubling himself in vain.<br> 4- Blindness of the heart and evilness of intention.<br> 5- Deprivation and disappointment, since the envier could scarcely attain his purpose, which is the removal of Allah’s blessings bestowed upon the believers.<br> The envied person, on the other hand, is unharmed with regard to his religious and worldly affairs.
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