Al-Hakam (may Allah have mercy on him) said: I asked Miqsam (may Allah have mercy on him): I pray witr with three rak'ahs, then I go out to the prayer for fear of missing it. He said: "It is only valid with five or seven rak'ahs." So I asked: From whom is this narrated? He said: From a trustworthy narrator, from Sayyidah Maymunah (may Allah be pleased with her), from Sayyidah Aishah (may Allah be pleased with her), from the Prophet (peace and blessings be upon him).
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20436