(755 ILCS 5/6-17) (from Ch. 110 1/2, par. 6-17)

Sec. 6-17.

Witness to appear for probate - penalty.) It is the duty of a witness to
any will executed in this State to appear before the court at the hearing
on the admission of
the will to probate and testify concerning the execution and validity of
the will unless proof
of will is made by another method as provided in this Act.  The court may
attach and punish by
fine and imprisonment, or either, any witness who, without a reasonable excuse, fails to
appear and testify when subpoenaed.

(Source: P.A. 79-328.)