The Didache, chapter 16, section 1 (written as early as 70 to 90 AD. or as late as 120 to 180 A.D.): "'Be vigilant over your life; 'let your lamps' not be extinguished, or your loins ungirded, but be prepared, for you know not the hour in which our Lord will come."
I Didache, 70-180 AD - Isahluko 16, Isigaba 1: Niqaphe ukuphila kwakho; ake nezibani zenu kungacimi, noma ezinkalweni zakho ungired, kodwa uzilungiselele, + ngoba niyazi hhayi ihora Ngazo Ithu Lord kuyofika. "