  In the framework of the heavy quark effective theory, the leading order
Isgur-Wise functions relevant to semileptonic decays of the orbitally $P$-wave
excited $B_{s}$ meson states $B^{**}_{s}$, including the newly found narrow
$B_{s1}(5830)$ and $B^{*}_{s2}(5840)$ states, into the ($D_{s1}(2536)$,
$D^{*}_{s2}(2573)$) doublet are calculated from QCD sum rules. With these
universal form factors, the decay rates and branching ratios are also
estimated.
