Allah, forgive my people for they do not know
Authentic hadithعن أبي عبد الرحمن عبد الله بن مسعود رضي الله عنه قال: كَأَنِّي أَنْظُر إلى رسول الله صلى الله عليه وسلم يَحْكِي نَبِيًّا من الأنبياء، صلوات الله وسلامه عليهم، ضربه قومه فَأَدْمَوْهُ، وهو يمَسحُ الدَم عن وجهِهِ، يقول: «اللهم اغفر لِقَوْمِي؛ فإنهم لا يعلمون».
Abu ‘Abdur-Rahmān ‘Abdullāh ibn Mas‘ūd (may Allah be pleased with him) said: "It is as though I am looking at Allah's Messenger as he tells the story of one of the prophets (peace be upon them) as his people struck him and caused him to bleed, and he wiped the blood from his face, saying: 'Allah, forgive my people for they do not know.'"
Explanation
Our prophet related a story about another prophet, saying that his people struck him and as he wiped blood off his face invoking Allah for their forgiveness. This consists in the furthest extent of patience and leniency. Not only did he pray for them but he also found an excuse for them out of sympathy for them due to their ignorance of the facts.
Source · Narrated by Bukhari & Muslim
From the Hadith Encyclopedia (hadeethenc.com).