Sahih Muslim Book - 18, Hadith - 3742

وَحَدَّثَنِى أَبُو الرَّبِيعِ الزَّهْرَانِىُّ حَدَّثَنَا حَمَّادٌ حَدَّثَنَا أَيُّوبُ عَنْ حَفْصَةَ عَنْ أُمِّ عَطِيَّةَ قَالَتْ كُنَّا نُنْهَى أَنْ نُحِدَّ عَلَى مَيِّتٍ فَوْقَ ثَلاَثٍ إِلاَّ عَلَى زَوْجٍ أَرْبَعَةَ أَشْهُرٍ وَعَشْرًا وَلاَ نَكْتَحِلُ وَلاَ نَتَطَيَّبُ وَلاَ نَلْبَسُ ثَوْبًا مَصْبُوغًا وَقَدْ رُخِّصَ لِلْمَرْأَةِ فِى طُهْرِهَا إِذَا اغْتَسَلَتْ إِحْدَانَا مِنْ مَحِيضِهَا فِى نُبْذَةٍ مِنْ قُسْطٍ وَأَظْفَارٍ.

It was narrated that Umm 'Atiyyah said: "We were forbidden to mourn for more than three days for anyone who dies, except for a husband, four months and ten days, when we were not to put on kohl or perfume, or wear dyed garments. But a concession was granted to a woman when she purifies herself - when one of us washed herself (Ghusl) following menses -to use a little Qust or Azfar."