Al-Kāfi - Volume 3 > Women during Hayd Nurse a Patient (The following chapters are about rules of washing a dead body for burial, shrouding and other matters of burial, and are best explained in the form of fatwa. Consult current fatwa about them.)
Hadith #1

1ـ عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ وَعِدَّةٌ مِنْ أَصْحَابِنَا عَنْ سَهْلِ بْنِ زِيَادٍ عَنِ ابْنِ مَحْبُوبٍ عَنْ عَلِيِّ بْنِ أَبِي حَمْزَةَ قَالَ قُلْتُ لأَبِي الْحَسَنِ (عَلَيْهِ الْسَّلام) الْمَرْأَةُ تَقْعُدُ عِنْدَ رَأْسِ الْمَرِيضِ وَهِيَ حَائِضٌ فِي حَدِّ الْمَوْتِ فَقَالَ لاَ بَأْسَ أَنْ تُمَرِّضَهُ فَإِذَا خَافُوا عَلَيْهِ وَقَرُبَ ذَلِكَ فَلْتَتَنَحَّ عَنْهُ وَعَنْ قُرْبِهِ فَإِنَّ الْمَلاَئِكَةَ تَتَأَذَّى بِذَلِكَ.

1. Ali ibn Ibrahim has narrated from his father from and a number of our people have narrated from Sahl ibn Ziyad from ibn Mahbub Ali ibn abu Hamzah who has said the following: “I once asked abu al-Hassan, ‘Alayhi al-Salam, about a woman who during her Hayd (menses) sits near the head of one who is about to die. He (the Imam) said, ‘It is not harmful if she is nursing. However, when death approaches, she must move away from places nearby; angels suffer thereby (Hayd (menses)).”