1. Sappa Sutta. Once, when the Buddha was staying at the Kalandakanivāpa in Veluvana, Māra appeared before him in the shape of a monstrous cobra and tried to frighten him. But the Buddha, recognizing him, said that Buddhas knew no fear. S.i.106f.
2. Sappa Sutta. The five disadvantages in a black snake, and the same disadvantages in a woman they are unclean, evil smelling, timid, fearful and betray friends. A.iii.260.
3. Sappa Sutta. Same as (2), the qualities being anger, ill will, poison (passion in a woman), forked tongue and treachery. A.iii.260.