Ibn 'Abbas reported that the Messenger of Allah (ﷺ) used to recite in first of the two (supererogatory) rak'ahs of the dawn:
"Say: We believed in Allah and what was revealed to us..." verse 136 from Surah Baqara, and in the second of the two: "I believe in Allah and I bear testimony that we are Muslims" (3:52).
Reference: Sahih Muslim 727 a In-book : Book 6, Hadith 121 USC-MSA web (English) : Book 4, Hadith 1576 (deprecated)
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