Sayyiduna Abu Musa Ash'ari (may Allah be pleased with him) said: When the Messenger of Allah (peace and blessings be upon him) performed Hajj, I came to him (returning from Yemen) and he was encamped in the valley of Batha. He (peace be upon him) asked me: "Did you intend to perform Hajj?" I replied: Yes. He said: "With what intention did you enter Ihram?" I replied: With the same intention as you did. He said: "You have done well. Now go, perform the Tawaf of the Ka'bah and the Sa'i between Safa and Marwah, then come out of Ihram." Sayyiduna Abu Musa (may Allah be pleased with him) said: I performed the Tawaf and the Sa'i between Safa and Marwah, then I went to a woman from (my family) Banu Qais who removed lice from my head (i.e., combed my hair). After that, I began giving the fatwa to people to come out of Ihram after Umrah, i.e., to perform Tamattu'. Then a man said to me: O Abdullah bin Qais (this is the name of Sayyiduna Abu Musa, may Allah be pleased with him), refrain from this fatwa, for you do not know that after you, the Commander of the Faithful has issued a new ruling. So I announced: O people! Those to whom we have given the fatwa (of Tamattu'), let them wait, for the Commander of the Faithful is about to arrive; you should follow him. When the Commander of the Faithful (Sayyiduna Umar, may Allah be pleased with him) arrived, I mentioned this to him. He said: The fact is that we act upon the Book of Allah, Allah Almighty has commanded to remain in the state of Ihram «وَأَتِمُّوا الْحَجَّ وَالْعُمْرَةَ لِلَّهِ» and we also act upon the Sunnah of the Messenger of Allah (peace and blessings be upon him), who did not come out of Ihram until the sacrificial animal was offered.