Kitāb al-Ghayba > Philosophy and wisdom of Occultation
Hadith #21

فإن قيل: إذا كان الخوف أحوجه إلى الاستتار فقد كان آباؤه عليه السلام عندكم على تقية وخوف من أعدائهم فكيف لم يستتروا؟

If it is said: If it is fear that has forced him to go into hiding, verily his forefathers, according to you, were living under dissimulation (Taqayyah) and fear from their enemies. Why did they not go into hiding also?