It wasnarrated that Ibn 'Umar said:
"The Prophet (ﷺ) used torecitein the Maghrib: 'Say: O you disbelievers!'[Al-Kafirun (109)]and'Say: He is Allah, (the) One.'"[Al-Ikhlas (112)] (DE)
English reference (DE): Vol. 1, Book 5, Hadith 833 (DE)
Arabic reference (DE): Book 5, Hadith 882 (DE)