Warning against harming them:

Ibn `Abbaas (a Companion and the cousin of the Prophet of Allah, sallallaahu ‘alayhi wa sallam) said: “The Prophet of Allah, sallallaahu ‘alayhi wa sallam, said: ‘The one who curses his father is cursed; the one who curses his mother is cursed; the one who gives a blind man wrong directions and causes him to be lost is cursed1 …’”