Abu Hurairah (RA) reported that the Messenger of Allah (ﷺ) recited in the two (supererogatory) rak'ahs of the dawn (prayer): "Say: O unbelievers," (Qur'an, cix.) and "Say: Allah is one" (cxii.).
Related hadith on this topic
Explanation & Benefits
Shaykh Umar Farooq Saeedi
1256. Commentary:
The choice and adherence to this recitation is recommended (mustahabb), and from a semantic perspective, it holds special significance in that, at the very beginning of the day, a Muslim declares his disavowal from disbelief and disbelievers, and affirms and acknowledges the oneness (tawhid) of Allah, the Mighty and Majestic, as well as His names and attributes. Furthermore, mention of other recitations will come ahead.
Source: Sunan Abu Dawood – Commentary by Shaykh Umar Farooq Saeedi, Page: 1256
Maulana Ataullah Sajid
Benefit:
Reciting from another place in the Noble Qur’an is also permissible. (See: Benefits of Hadith 1144)
Source: Commentary on Sunan Ibn Mājah by Mawlānā ‘Atā’ullāh Sājid, Page: 1148