Translation:

2. (It teacheth) that ye should worship none but Allah. (Say:) "Verily I am (sent) unto you from Him to warn and to bring glad tidings:

Notes (Tafseer)

1494. 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.