Narrated `Abdullah bin Mas`ud
Allah's Messenger (ﷺ) said, "Whoever takes a false oath so as to take the property of a Muslim (illegally) will meet Allah while He will be angry with him." Al-Ash'ath said: By Allah, that saying concerned me. I had common land with a Jew, and the Jew later on denied my ownership, so I took him to the Prophet who asked me whether I had a proof of my ownership. When I replied in the negative, the Prophet asked the Jew to take an oath. I said, "O Allah's Messenger (ﷺ)! He will take an oath and deprive me of my property." So, Allah revealed the following verse: "Verily! Those who purchase a little gain at the cost of Allah's covenant and their oaths." (3.77)
Narrated `Abdullah bin Ka`b bin Malik
Ka`b demanded his debt back from Ibn Abi Hadrad in the Mosque and their voices grew louder till Allah's Messenger (ﷺ) heard them while he was in his house. He came out to them raising the curtain of his room and addressed Ka`b, "O Ka`b!" Ka`b replied, "Labaik, O Allah's Messenger (ﷺ)." (He said to him), "Reduce your debt to one half," gesturing with his hand. Ka`b said, "I have done so, O Allah's Apostle!" On that the Prophet (ﷺ) said to Ibn Abi Hadrad, "Get up and repay the debt, to him."
Narrated `Umar bin Al-Khattab
I heard Hisham bin Hakim bin Hizam reciting Surat-al-Furqan in a way different to that of mine. Allah's Messenger (ﷺ) had taught it to me (in a different way). So, I was about to quarrel with him (during the prayer) but I waited till he finished, then I tied his garment round his neck and seized him by it and brought him to Allah's Messenger (ﷺ) and said, "I have heard him reciting Surat-al-Furqan in a way different to the way you taught it to me." The Prophet (ﷺ) ordered me to release him and asked Hisham to recite it. When he recited it, Allah s Apostle said, "It was revealed in this way." He then asked me to recite it. When I recited it, he said, "It was revealed in this way. The Qur'an has been revealed in seven different ways, so recite it in the way that is easier for you."