Musannaf Ibn Abi Shayba 3:5241

Waki’ narrated to us, Iyas ibn Daghfal narrated, he said: Al-Hasan was asked about a woman who made a vow upon herself that if her husband were released from prison, she would pray two rak'ahs in every mosque in Basra where the congregational prayer is held. Al-Hasan said: She should pray in the mosque of her people, for she cannot bear that. If Umar ibn al-Khattab had caught her, he would have made her head ache.