Silsilat al-Ahadith al-Sahihah

Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) narrates that the Messenger of Allah (peace and blessings be upon him) said: “«قُلْ يَا أَيُّهَا الْكَافِرُونَ», that is, Surah Al-Kafirun, is equal to one-fourth of the Qur’an.”