Al Hisn ul Haseen, by Imam al-Hafidh Abi al Khayr Muhammad Ibn al Jazri (Rahimuhullah)

Adaab ad-Dua (i.e. Etiquettes of making dua).. Translation: One should ask Allah through the “WASEELA (Intercession)” of Anbiya and Pious servants of Allah… (towards the end Imam Ibn Jazri said) After completing the dua one should wipe his face with his hands [Al Hisnul Hiseen, Page No. 25]