Riyad us-Salihin Hadith 235

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". [Muslim].