"That is a vein, so when your period comes, do not pray, and when your period is over, purify yourself and pray in between one period and the next." Abu 'Abdur-Rahman said: Hisham bin 'Urwah reported this Hadith from 'Urwah, and he did not mention what Al-Mundhir mentioned in it.
" إِنَّمَا ذَلِكِ عِرْقٌ فَانْظُرِي إِذَا أَتَاكِ قَرْؤُكِ فَلاَ تُصَلِّي وَإِذَا مَرَّ قَرْؤُكِ فَلْتَطَهَّرِي ثُمَّ صَلِّي مَا بَيْنَ الْقُرْءِ إِلَى الْقُرْءِ "