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.
Narrated Ibn 'Abbas: that the Messenger of Allah (ﷺ) said: Idha Zulzilat is equal to half of the Qur'an, Qul Huwa Allahu Ahad is equal to a third of the Qur'an, and Yul Ya Ayyuhal-Kafirun is equal to a fourth of the Qur'an.
Narrated Anas bin Malik: that the Messenger of Allah (ﷺ) said to a man among his Companions: Have you married O so-and-so? He said: No by Allah O Messenger of Allah! And I do not have anything to marry with. He said: Do you not know: Qul Huwa Allahu Ahad? He said: Of course. He said: It is a third of the Qur'an. He said: Do you not know Idha Ja Nasrullahi Wal-Fath? He said: Of course. He said: It is a fourth of the Qur'an. He said: Do you not know Qul Ya Ayyuhal-Kafirun? He said: Of course. He said: It is a fourth of the Qur'an. He said: Do you not know Idha Zulzilat Al-Ard? He said: Of course. He said: It is a fourth of the Qur'an. He said: Marry, marry.