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The conjunction an ("that") preceding the next sentence ("that you shall...", etc.) is in this rendering expressed by means of a colon. The interpolation, between brackets, of the words "Say, O Prophet" is necessitated by the first-person construction of this sentence. The subsequent passage - up to the end of verse {4} - outlines both the "warning" and the "glad tidings" referred to above, and thus circumscribes elliptically the whole of the message entrusted to the Prophet.
Al-Mustafa's Message-as was the Message of all apostles-was to warn against evil, and to bring the glad tidings of Allah's Mercy and Grace to all who would receive it in Faith and trust in Allah. This double Message is preached illustratively in this Sura.