四分律刪補隨機羯磨 2.218

2.218

（佛言：「若比丘應十四日自恣，比丘尼應十五日自恣。」此謂二眾相依住法。若無緣者，三日俱得自恣。）

(The Buddha said: "Bhikṣus should perform pravāraṇā on the fourteenth day, and bhikṣuṇīs should perform pravāraṇā on the fifteenth day." This refers to the rule when the two assemblies dwell in mutual reliance. If there are no particular circumstances, all three days are permissible for pravāraṇā.)