Skandapurana 16.24.183

16.24.183

somavāravrateneśaṃ samārādhaya śaṃkaram ..
evaṃ kṛte vyādhināśastava putryā bhaviṣyati .. 183 ..

propitiate the Lord Śaṃkara with the vow of Somavāra. / When this is done, the destruction of the disease will happen for your daughter.”