  We show that QCD contains stable four-quark QQ\qbar\qbar hadronic states in
the limit where the heavy quark mass goes to infinity. (Here Q denotes a heavy
quark, \qbar a light antiquark and the stability refers only to the strong
interactions.) The long range binding potential is due to one pion exchange
between ground state Q\qbar mesons, and is computed using chiral perturbation
theory. For the Q=b, this long range potential may be sufficiently attractive
to produce a weakly bound two meson state.
