Tafsir of Ghafir 40:55

فاصبر

So be patient, means, `O Muhammad,'

إن وعد الله حق

Verily, the promise of Allah is true, means, `We have promised that your word will prevail and that the ultimate victory will be for you and those who follow you, and Allah does not break His promises. What We have told you is true and there is no doubt in it whatsoever.'

واستغفر لذنبك

and ask forgiveness for your fault, This encourages the Ummah to seek forgiveness.

وسبح بحمد ربك بالعشي

and glorify the praises of your Lord in the `Ashi, meaning, at the end of the day and the beginning of the night,

واﻻبكار

and in the Ibkar. meaning, at the beginning of the day and the end of the night