Sunan Ibn Majah, Book 1, Hadith 695 (In-Book) ⓘ
It was narrated that 'Abdullah bin Sa'd said: "I asked the Messenger of Allah about eating with a menstruating woman and he said: 'Eat with her.'"
حَدَّثَنَا أَبُو بِشْرٍ، بَكْرُ بْنُ خَلَفٍ حَدَّثَنَا عَبْدُ الرَّحْمَنِ بْنُ مَهْدِيٍّ، عَنْ مُعَاوِيَةَ بْنِ صَالِحٍ، عَنِ الْعَلاَءِ بْنِ الْحَارِثِ، عَنْ حَرَامِ بْنِ حَكِيمٍ، عَنْ عَمِّهِ عَبْدِ اللَّهِ بْنِ سَعْدٍ، قَالَ سَأَلْتُ رَسُولَ اللَّهِ ـ صلى الله عليه وسلم ـ عَنْ مُوَاكَلَةِ الْحَائِضِ فَقَالَ " وَاكِلْهَا " .
also referenced under: Hadith 651 (Reference) & Volume 1, Book 1, Hadith 651 (DarusSalam)