Sulaiman al-A'mash الأعمش / سليمان بن مهران · The Chapters on Rulings

“Whoever takes the wrongdoer's side in a dispute or supports wrongdoing, he will remain subject to the wrath of Allah until he gives it up.”

the Messenger of Allah (ﷺ) rid Mu'adh bin Jabal of his creditors, then he appointed him governor of Yemen. Mu'adh said: “The Messenger of Allah (ﷺ) settled my debts with my creditors using what wealth I had, then he appointed me as governor.”

Abu Sa'eed Al-Khudri recited this Verse: “O you who believe! When you contract a debt for a fixed period...” until: “then if one of you entrusts the other.” Then he said: “This abrogates what came before.”

the Messenger of Allah (ﷺ) allowed the People of the Book to testify against one another.