Allah's Messenger (ﷺ) said, "A Muslim is a brother of another Muslim. So he should neither oppress him nor hand him over to an oppressor. And whoever fulfilled the needs of his brother, Allah will fulfill his needs."
Sahih al-Bukhari Book 89, Hadith 12
← Previous Hadith Allah's Messenger (ﷺ) said, "(The Prophet) Abraham migrated with his wife Sarah till he reached a town where there was a king or a tyrant who sent a message, to Abraham, ordering him to send Sarah to him. So when Abraham had sent Sarah, the tyrant got up, intending to do evil with her, but she got up and performed ablution and prayed and said, 'O Allah ! If I have believed in You and in Your Apostle, then do not empower this oppressor over me.' So he (the king) had an epileptic fit and started moving his legs violently. "

Sahih al-Bukhari Book 89, Hadith 11 Next Hadith → Allah's Messenger (ﷺ) said, "Help your brother whether he is an oppressor or an oppressed," A man said, "O Allah's Messenger (ﷺ)! I will help him if he is oppressed, but if he is an oppressor, how shall I help him?" The Prophet (ﷺ) said, "By preventing him from oppressing (others), for that is how to help him."

Sahih al-Bukhari Book 89, Hadith 13