And, the one who brings the Truth and the one who affirms it - they, indeed they, are the upright. (Note that the statements in this verse and the preceding one allude to the Messenger and the recipients of the Message)
And he (Muhammad SAW) who has brought the truth (this Quran and Islamic Monotheism) and (those who) believed therein (i.e. the true believers of Islamic Monotheism), those are Al- Muttaqoon (the pious and righteous persons - see V.2:2)
As for he who has brought the Truth (about being a servant to Allah and the reality of vicegerency being an experience in the body) and confirmed it (Hadhrat Abu Bakr) they are the protected ones!
Al-muntakhab fi tafsir al-Qur'an al-Karim
And he who has conveyed the divine message of truth to the people as well as to those who are convinced of its conformity with fact and use it to exhort others to what is good, laudable and divine are those who keep in awe of Allah and entertain the profound reverence dutiful to Him