It is narrated from Sayyiduna Mu'adh bin Jabal (may Allah be pleased with him) that when the Messenger of Allah (peace and blessings be upon him) sent him to Yemen, he said: O Messenger of Allah! Give me some advice. He (peace and blessings be upon him) said: "Make your religion sincere (free of showing off), and even a little deed will suffice you (for salvation)." This hadith has a sahih (authentic) chain of narration, but the two Shaykhs (Bukhari and Muslim) did not record it.