It is narrated from Hazrat Aisha that once the Prophet (peace be upon him) was in the mosque when he said to a slave girl, "Hand me the mat." The Prophet (peace be upon him) wanted to spread it and pray on it. She informed him that she was in her menstrual period. The Prophet (peace be upon him) said, "Her 'period' has not affected her hand."
Hadith Referenceمسند احمد / مسند النساء / 24747
Hadith Gradingحکم دارالسلام:حديث صحيح، وهذا إسناد حسن، م: 298