Sahih al-Bukhari 312

Arabic

حَدَّثَنَا أَبُو نُعَيْمٍ، قَالَ حَدَّثَنَا إِبْرَاهِيمُ بْنُ نَافِعٍ، عَنِ ابْنِ أَبِي نَجِيحٍ، عَنْ مُجَاهِدٍ، قَالَ قَالَتْ عَائِشَةُ مَا كَانَ لإِحْدَانَا إِلاَّ ثَوْبٌ وَاحِدٌ تَحِيضُ فِيهِ، فَإِذَا أَصَابَهُ شَىْءٌ مِنْ دَمٍ، قَالَتْ بِرِيقِهَا فَقَصَعَتْهُ بِظُفْرِهَا‏.‏

English translation

Narrated `Aisha:None of us had more than a single garment and we used to have our menses while wearing it. Whenever it got soiled with blood of menses we used to apply saliva to the blood spot and rub off the blood with our nails

Reference: Sahih al-Bukhari 312, Book of Menstrual Periods. English translation by Dr. Muhammad Muhsin Khan.