Tafsir of Al-An'am 6:115

وتمت كلمت ربك صدقا وعدﻻ

And the Word of your Lord has been fulfilled in truth and in justice. Qatadah commented, "In truth concerning what He stated and in justice concerning what He decided.'' Surely, whatever Allah says is the truth and He is Most Just in what He commands. All of Allah's statements are true, there is no doubt or cause for speculation about this fact, and all His commandments are pure justice, besides which there is no justice. All that He forbade is evil, for He only forbids what brings about evil consequences. Allah said in another Ayah,

يٲمرهم بالمعروف وينههم عن المنكر

He commands them with good; and forbids them from evil... (7:157) until the end of the Ayah.

ﻻ مبدل لكلماته

None can change His Words. meaning, none can avert Allah's judgment whether in this life or the Hereafter.

وهو السميع

And He is the All-Hearer, Hearing, His servants' statements,

العليم

The All-Knower. of their activities and lack of activity, Who awards each according to their deeds