Reference for Isaiah 42:24

The story of how Rabbi Joshua ben Chanania ransomed Rabbi Ishmael from captivity is told in the following manner. Rabbi Joshua ben Chanania was visiting a certain large Roman city in the cause of his people and he was told that within the prison there was a beautiful black eyed, curly headed Jewish boy who was held captive and was to be sold to some degenerate lascivious Roman. Rabbi Joshua ben Chanania approached the prison to speak with the boy and he began with a verse from Isaiah (42:24): Who gave Jacob to the looters and Israel to robbers? The boy responded with the second half of the verse, It is God, against whom we have sinned refusing to follow in his ways and to obey his teachings.