Continue whip stitching until you get to the opposite side of the tear.

Make a final stitch beyond the end of the tear to secure the stitching, just as it was anchored at the beginning of the tear.

Pass the needle through to the backside of the fabric.

Make a secure knot on the backside of the fabric using one of the techniques from Knot Thread to the Fabric (2 Ways) and trim the extra thread.