It has been confirmed in Sahih Muslim from Jabir that the
Messenger of Allah recited this Surah (Al-Kafirun) and
﴿قُلْ هُوَ اللَّهُ أَحَدٌ ﴾
(Say: "He is Allah One.'') (112:1) in the two
Rak`ahs of Tawaf. It is also recorded in Sahih Muslim in a Hadith of Abu
Hurayrah that the Messenger of Allah recited these two Surahs in the two
Rak`ahs (optional prayer) of the Morning prayer. Imam Ahmad recorded from Ibn
`Umar that the Messenger of Allah recited in the two Rak`ahs before the Morning
prayer and the two Rak`ahs after the Sunset prayer on approximately ten or
twenty different occasions,
﴿قُلْ يأَيُّهَا الْكَـفِرُونَ
﴾
(Say: "O Al-Kafirun!'') and
﴿قُلْ هُوَ اللَّهُ أَحَدٌ ﴾
(Say: " He is Allah One.'') (112:1) Ahmad also
recorded that Ibn `Umar said, "I watched the Prophet twenty-four or
twenty-five times reciting in the two Rak`ahs before the Morning prayer and the
two Rak`ahs after the Sunset prayer,
﴿قُلْ يأَيُّهَا الْكَـفِرُونَ
﴾
(Say: "O Al-Kafirun!'') and
﴿قُلْ هُوَ اللَّهُ أَحَدٌ ﴾
(Say: "He is Allah One.'') (112:1)'' Ahmad recorded
that Ibn `Umar said, "I watched the Prophet for a month and he would
recite in the two Rak`ahs before the Morning prayer,
﴿قُلْ يأَيُّهَا الْكَـفِرُونَ
﴾
(Say: "O Al-Kafirun.'') and
﴿قُلْ هُوَ اللَّهُ أَحَدٌ ﴾
(Say: "He is Allah One.'') (112:1)'' This was also
recor- ded by At-Tirmidhi, Ibn Majah and An-Nasa'i. At-Tirmidhi said,
"Hasan.'' It has already been mentioned previously in a Hadith that it
(Surat Al-Kafirun) is equivalent to a fourth of the Qur'an and Az-Zalzalah is
equivalent to a fourth of the Qur'an.