The Story of Opatala: A Jataka Tale : หน้า 10/131

Padakusalamánava-Játaka.1 . "Opatala, by Ganges," etc.—This story the Master dwelling at Jetavana told concerning a certain boy. He was, they say, the son of a householder at Savatti, just seven years old, and skilled in recognizing footsteps. Now his father being minded to prove him went without his knowing it to a friend's house. The boy, without even asking where his father had gone, by tracing his footsteps, came and stood before him. So his father one day asked him saying, "When I went off without telling you, how did you know where I was gone?" "My dear father, I recognized your footsteps. I am skilled in this way." Then his father, to prove him, went out of his house after the early meal, and going into his next-door neighbour’s house, from it passed into another, and from this third house again returned to his own home, and thence made his way to the North gate, and passing out by it made a circuit of the city from right to left. And coming to Jetavana he saluted the Master and sat down to listen to the Law. 1 http://www.sacred-texts.com/bud/j3/j3133.htm The Favourite Jatakas 8