It is narrated from Sayyiduna Abdullah bin Amr (may Allah be pleased with them both) that Sayyiduna Mu'adh bin Jabal (may Allah be pleased with him) intended to go on a journey and said: "O Messenger of Allah (peace and blessings be upon him), advise me." He (peace and blessings be upon him) said: "Worship Allah and do not associate anything with Him." He said: "O Messenger of Allah (peace and blessings be upon him), tell me more." He (peace and blessings be upon him) said: "When you commit an evil deed, then do a good deed (after it)." He said: "O Messenger of Allah (peace and blessings be upon him), tell me more." He (peace and blessings be upon him) said: "Remain steadfast and make your character excellent." This hadith has a sahih (authentic) chain, and they (the two Shaykhs) did not record it.