一切經音義 23.155

23.155

則為不斷（為于危反廣雅曰則即也為猶是也下諸句並準此）。

Then it is not severed [則為不斷] (wei [為] is pronounced 于危 [j- + (ŋ)wie > wéi]. The Guangya says: “Ze [則] means thereupon; wei [為] is like ‘is’.” The subsequent clauses should all follow this).