#include <Wire.h>
#define BUFFER_SIZE (192)

unsigned char buf[BUFFER_SIZE];

void setup()
{
  Wire.begin(4);                // join i2c bus with address #4
  Wire.onReceive(receiveEvent); // register event
}

void loop()
{
  //Do whatever you need to with buf in here.
/* you can access the bytes directly as an array, with the first 96 being buf[0] to buf[95] and second buf[96] to buf[191], or if you need to pass to a function whateverFunction(buf) or with the size whateverFunction(buf, 96);
Then the second 96 bytes are passed like this whateverFunction(buf + 96, 96) */

  delay(100); //remove this when you have code in this loop
}

// function that executes whenever data is received from master
// this function is registered as an event, see setup()
// this is blocking, so no other code will run while this is receiving,
// this will only work if you send all 192 bytes at once.
void receiveEvent(int howMany)
{
  unsigned char i = 0;
  while(Wire.available() && (i < BUFFER_SIZE))
  {
    buf[i++] = Wire.read(); // receive byte
  }
}