Look below -->

//This is a anti spam script 
//It will ban anyone that spams 4 lines in 3 seconds
//you can change this by:
//inc -u"3" %spam. [ $+ [ $nick ] ] (the bit in "" is the seconds)
//if (%spam. [ $+ [ $nick ] ] == "4") (the bit in "" is the lines)

on *:TEXT:*:#:{
  inc -u3 %spam. [ $+ [ $nick ] ]
  if (%spam. [ $+ [ $nick ] ] == 4) {
    ban $chan $address($nick,1)
    kick $chan $nick Spam
  }
}