Sahih al-Bukhari, Volume 3, Book 27, Hadith 21 (USC-MSA) ⓘ

Narrated Abu Musa Al-Ash`ari: I came to the Prophet at Al-Batha' while his camel was kneeling down and he asked me, "Have you intended to perform the Hajj?" I replied in the affirmative. He asked me, 'With what intention have you assumed Ihram?" I replied, "I have assumed Ihram with the same intention as that of the Prophet. He said, "You have done well. Perform the Tawaf of the Ka`ba and (the Sai) between As-Safa and Al- Marwa and then finish the Ihram." So, I performed the Tawaf around the Ka`ba and the Sai) between As-Safa and Al-Marwa and then went to a woman of the tribe of Qais who cleaned my head from lice. Later I assumed the Ihram for Hajj. I used to give the verdict of doing the same till the caliphate of `Umar who said, "If you follow the Holy Book then it orders you to remain in the state of Ihram till you finish from Hajj, if you follow the Prophet then he did not finish his Ihram till the Hadi (sacrifice) had reached its place of slaughtering (Hajj-al-Qiran).

حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا غُنْدَرٌ، حَدَّثَنَا شُعْبَةُ، عَنْ قَيْسِ بْنِ مُسْلِمٍ، عَنْ طَارِقِ بْنِ شِهَابٍ، عَنْ أَبِي مُوسَى الأَشْعَرِيِّ ـ رضى الله عنه ـ قَالَ قَدِمْتُ عَلَى النَّبِيِّ صلى الله عليه وسلم بِالْبَطْحَاءِ وَهُوَ مُنِيخٌ فَقَالَ ‏"‏ أَحَجَجْتَ ‏"‏‏.‏ قُلْتُ نَعَمْ‏.‏ قَالَ ‏"‏ بِمَا أَهْلَلْتَ ‏"‏‏.‏ قُلْتُ لَبَّيْكَ بِإِهْلاَلٍ كَإِهْلاَلِ النَّبِيِّ صلى الله عليه وسلم قَالَ ‏"‏ أَحْسَنْتَ‏.‏ طُفْ بِالْبَيْتِ وَبِالصَّفَا وَالْمَرْوَةِ ثُمَّ أَحِلَّ ‏"‏‏.‏ فَطُفْتُ بِالْبَيْتِ، وَبِالصَّفَا وَالْمَرْوَةِ، ثُمَّ أَتَيْتُ امْرَأَةً مِنْ قَيْسٍ، فَفَلَتْ رَأْسِي، ثُمَّ أَهْلَلْتُ بِالْحَجِّ‏.‏ فَكُنْتُ أُفْتِي بِهِ، حَتَّى كَانَ فِي خِلاَفَةِ عُمَرَ فَقَالَ إِنْ أَخَذْنَا بِكِتَابِ اللَّهِ فَإِنَّهُ يَأْمُرُنَا بِالتَّمَامِ، وَإِنْ أَخَذْنَا بِقَوْلِ النَّبِيِّ صلى الله عليه وسلم فَإِنَّهُ لَمْ يَحِلَّ حَتَّى يَبْلُغَ الْهَدْىُ مَحِلَّهُ‏.‏