Musnad Ahmad 1246:0

Narrated to us by Waki’, from al-Walid ibn Abdullah ibn Jami’, from his grandmother, from Umm Waraqah bint Abdullah ibn al-Harith al-Ansariyyah, that the Prophet (ﷺ) used to visit her in her house. He appointed a caller (mu’adhdhin) for her to call the adhan for her, and he commanded her to lead the people of her household in prayer. She said: He (the Prophet) said to me: "Lead the people of your household in prayer." She said: And she had a caller who would call the adhan for her, and she would lead the people of her household in prayer. She said: And the Prophet (ﷺ) used to call her "the martyr." She would say: "Lead the people of my household in prayer." She said: And she was among those who gathered the Quran.