Kathasaritsagara 3.6.162

And Sundaraka heard that spell again, but failed again to retain it; for how can magic practices be thoroughly learnt without explanation by a teacher? Then he ate some roots there, and put some others in the cow-house to take away with him, and remained there as before; then Kálarátri came, and climbing up into the cow-house, flew through the air by night, and stopping the vehicle, entered her house. In the morning Sundaraka also left that house, and taking the roots with him he went to the market in order to procure money with which to purchase food. And while he was selling them there, some servants of the king's, who were natives of Málava, took them away without paying for them, seeing that they the produce of their own country. Then he began to remonstrate angrily, so they manacled him, and took him before the king on a charge of throwing stones at them, and his friends followed him. Those villains said to the king—" This man, when we asked him how he managed continually to bring roots from Málava and sell them in Ujjayiní, would not give us any answer, on the contrary he threw stones at us."

And Sundaraka heard that spell again, but failed again to retain it; for how can magic practices be thoroughly learnt without explanation by a teacher? Then he ate some roots there, and put some others in the cow-house to take away with him, and remained there as before; then Kálarátri came, and climbing up into the cow-house, flew through the air by night, and stopping the vehicle, entered her house. In the morning Sundaraka also left that house, and taking the roots with him he went to the market in order to procure money with which to purchase food. And while he was selling them there, some servants of the king's, who were natives of Málava, took them away without paying for them, seeing that they the produce of their own country. Then he began to remonstrate angrily, so they manacled him, and took him before the king on a charge of throwing stones at them, and his friends followed him. Those villains said to the king—" This man, when we asked him how he managed continually to bring roots from Málava and sell them in Ujjayiní, would not give us any answer, on the contrary he threw stones at us."