Sahih al-Bukhari 1760, 1761
Narrated Ibn `Abbas:
A menstruating woman was allowed to leave Mecca if she had done Tawaf-al-Ifada. Tawus (a subnarrator) 
said from his father, "I heard Ibn `Umar saying that she would not depart. Then later I heard 
him saying that the Prophet (ﷺ) had allowed them (menstruating women) to depart."
حَدَّثَنَا مُسْلِمٌ، حَدَّثَنَا وُهَيْبٌ، حَدَّثَنَا ابْنُ طَاوُسٍ، عَنْ أَبِيهِ، عَنِ ابْنِ عَبَّاسٍ ـ رضى الله عنهما ـ قَالَ رُخِّصَ لِلْحَائِضِ أَنْ تَنْفِرَ إِذَا أَفَاضَتْ‏.‏   قَالَ وَسَمِعْتُ ابْنَ عُمَرَ، يَقُولُ إِنَّهَا لاَ تَنْفِرُ‏.‏ ثُمَّ سَمِعْتُهُ يَقُولُ بَعْدُ إِنَّ النَّبِيَّ صلى الله عليه وسلم رَخَّصَ لَهُنَّ‏.‏