Tafsir of Al-An'am 6:48

وما نرسل المرسلين إﻻ مبشرين ومنذرين

And We send not the Messengers but as bearers of glad tidings and as warners. means, the Messengers bring good news to Allah's servants, as well as, command all that is good and righteous. They also warn those who disbelieve in Allah of His anger and of all types of torment. Allah said,

فمن آمن وأصلح

So whosoever believes and does righteous good deeds, meaning, whoever believes in his heart with what the Messengers were sent with and makes his works righteous by imitating them;

فﻼ خوف عليهم

upon such shall come no fear, concerning the future,

وﻻ هم يحزنون

nor shall they grieve. about what they missed in the past and left behind them in this world. Certainly, Allah will be the Wali and Protector over what they left behind. Allah said next,

والذين كذبوا باياتنا يمسهم العذاب بما كانوا يفسقون