Sunan At-Tirmidhi

Narrated Anas bin Malik:that the Messenger of Allah (ﷺ) said: ""Whoever recites Idha Zulzilat, it equals half of the Qur'an for him. Whoever recites: Qul Ya Ayyuhal-Kafirun it equals a fourth of the Qur'an for him. And whoever recites: Qul Huwa Allahu Ahad it equals a third of the Qur'an for him