  We show that up to commensurability there are only finitely many cocompact
arithmetic Kleinian groups generated by rotations. This implies, in particular,
that there exist only finitely many conjugacy classes of cocompact two
generated arithmetic Kleinian groups. The proof of the main result is based on
a generalized Gromov--Guth inequality and bounds for the hyperbolic and tube
volumes of the quotient orbifolds.
