Samudayadhammasutta

sn22.126:1.1 At Sāvatthī.

sn22.126:1.2 Then a mendicant went up to the Buddha, bowed, sat down to one side, and said to him:

sn22.126:1.3 “Sir, they speak of this thing called ‘ignorance’.

sn22.126:1.4 What is ignorance?

sn22.126:1.5 And how is an ignoramus defined?”