Sahih Muslim 1221 a
Abu Musa (Allah be pleased with him) said:
I came to the Messenger of Allah (ﷺ) as he was encamping at Batha. He said to me: Did you intend to perform Hajj? I said: Yes. He again said: With what intention have you entered into the state of Ihram (for Ifrad, Qiran or Tamattu'). I said: I pronounced Talbiya (I have entered into the state of Ihram ) with that very aim with which the Messenger of Allah (ﷺ) is pronouncing Talbiya. He (the Holy Prophet) said; You have done well. Then circumambulate the House and run between al-Safa' and al-Marwa' and put off Ihram (as you have not brought the sacrificial animals along with you). So I circumambulated the House, and ran between al-Safa' and al-Marwa' and then came to a woman of the tribe of Qais and she rid my head of the lice. I again put on Ihram for Hajj. and continued giving religious verdict (according to this practice) till during the Caliphate of Umar (Allah be pleased with him) when a person said to him: Abu Musa, or Abdullah b. Qais, exercise restraint in delivering some religious verdict of yours, for you do not know what has been introduced after you by the Commander of the Believers in the rites (of Hajj). Thereupon he said: 0 people, whom we gave the religious verdict (concerning putting off Ihram ) they should wait, for the Commander of the Believers is about to come to you, and you should follow him. Umar (Allah be pleased with him) then came and I made a mention of it to him. whereupon he said: If we abide by the Book of Allah (we find) the Book of Allah has commanded us to complete the (. Hajj and 'Umra), and if we abide by the Sunnah of Allah's Messenger (ﷺ), we find that Allah's Messenger (ﷺ) did not put off Ihram till the sacrificial animal was brought to its end (till it was sacrificed).
حَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، وَابْنُ، بَشَّارٍ قَالَ ابْنُ الْمُثَنَّى حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ، أَخْبَرَنَا شُعْبَةُ، عَنْ قَيْسِ بْنِ مُسْلِمٍ، عَنْ طَارِقِ بْنِ شِهَابٍ، عَنْ أَبِي مُوسَى، قَالَ قَدِمْتُ عَلَى رَسُولِ اللَّهِ صلى الله عليه وسلم وَهُوَ مُنِيخٌ بِالْبَطْحَاءِ فَقَالَ لِي ‏"‏ أَحَجَجْتَ ‏"‏ ‏.‏ فَقُلْتُ نَعَمْ ‏.‏ فَقَالَ ‏"‏ بِمَ أَهْلَلْتَ ‏"‏ ‏.‏ قَالَ قُلْتُ لَبَّيْكَ بِإِهْلاَلٍ كَإِهْلاَلِ النَّبِيِّ صلى الله عليه وسلم ‏.‏ قَالَ ‏"‏ فَقَدْ أَحْسَنْتَ طُفْ بِالْبَيْتِ وَبِالصَّفَا وَالْمَرْوَةِ وَأَحِلَّ ‏"‏ ‏.‏ قَالَ فَطُفْتُ بِالْبَيْتِ وَبِالصَّفَا وَالْمَرْوَةِ ثُمَّ أَتَيْتُ امْرَأَةً مِنْ بَنِي قَيْسٍ فَفَلَتْ رَأْسِي ثُمَّ أَهْلَلْتُ بِالْحَجِّ ‏.‏ قَالَ فَكُنْتُ أُفْتِي بِهِ النَّاسَ حَتَّى كَانَ فِي خِلاَفَةِ عُمَرَ - رضى الله عنه - فَقَالَ لَهُ رَجُلٌ يَا أَبَا مُوسَى - أَوْ يَا عَبْدَ اللَّهِ بْنَ قَيْسٍ - رُوَيْدَكَ بَعْضَ فُتْيَاكَ فَإِنَّكَ لاَ تَدْرِي مَا أَحْدَثَ أَمِيرُ الْمُؤْمِنِينَ فِي النُّسُكِ بَعْدَكَ ‏.‏ فَقَالَ يَا أَيُّهَا النَّاسُ مَنْ كُنَّا أَفْتَيْنَاهُ فُتْيَا فَلْيَتَّئِدْ فَإِنَّ أَمِيرَ الْمُؤْمِنِينَ قَادِمٌ عَلَيْكُمْ فَبِهِ فَائْتَمُّوا ‏.‏ قَالَ فَقَدِمَ عُمَرُ - رضى الله عنه - فَذَكَرْتُ ذَلِكَ لَهُ فَقَالَ إِنْ نَأْخُذْ بِكِتَابِ اللَّهِ فَإِنَّ كِتَابَ اللَّهِ يَأْمُرُ بِالتَّمَامِ وَإِنْ نَأْخُذْ بِسُنَّةِ رَسُولِ اللَّهِ صلى الله عليه وسلم فَإِنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم لَمْ يَحِلَّ حَتَّى بَلَغَ الْهَدْىُ مَحِلَّهُ ‏.‏