It is stated in Sahih Ahadith that at the time of completing the recitation of the Holy Qur’an (Khatm-e-Qur’an) special mercies of Allah Ta’ala descend.
Imam-e-Tafseer Mujahid (Rahmatullahi Tala’a) said, that it was the habit of the Sahabah Ikram’s to supplicate gathered at the time of Khatm-e-Qur’an and that at the time of Khatm-e-Qur’an Haq Ta’ala’s special mercies descend.
And with a correct Isnad it is reported from Hadhrat Hassan (Radhiallaho Ta’ala Anho), that when he finished the recitation of Qur’an Majid he would gather his household to make Du’a. (Askar Nawawi)
[from “Uswa-e-Rasool Akram (Sallallahu Alayhi Wasallam)”
by Hadhrat Arifbillah Dr. Abdul Hayy Arifi (Nawarallahu Marqadahu)]