It is narrated from Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) that a man emigrated from Yemen to the Messenger of Allah (peace and blessings be upon him) and said: "O Messenger of Allah! I have emigrated." He (peace and blessings be upon him) said to him: "You have emigrated from shirk (polytheism), but now the matter is jihad. Do you have anyone (of your family) in Yemen?" He said: "My parents." He (peace and blessings be upon him) asked: "Have they given you permission?" He said: "No." He (peace and blessings be upon him) said: "Go back to them and ask their permission. If they give you permission, then fight in jihad; otherwise, be dutiful (and of service) to them." This hadith has a sahih (authentic) chain of narration, but the two Shaykhs (Bukhari and Muslim) did not record it with this wording; however, they agreed on the hadith of Sayyiduna Abdullah bin Amr (may Allah be pleased with them both): "Then strive (make jihad) in (serving) the two of them (your parents)."