Abbas - Tanwîr al-Miqbâs min Tafsîr Ibn ‘Abbâs
(Whoso doeth right) sincerely between him and his Lord (it is for his soul) the reward of that is for his soul, (and whoso doeth wrong it is against it) and whosoever associates partners with Allah, the punishment of this associationism will be against his own soul. (And thy Lord) O Muhammad (is not at all a tyrant to His slaves) such that He would punish them for no crime.
Whoever acts righteously, it is for [the good of] his own soul, that he acts [thus], and whoever does evil, it is to the detriment thereof, in other words, the harm consequent from his evildoing will [only] be to him. And your Lord is not [at all] a tyrant to His servants, that is, He is not One of injustice, as He, exalted be He, says: Surely God shall not wrong so much as the weight of an atom [Q. 4:40].
(Whosoever does righteous good deed, it is for himself;) means, the benefit of which will come to him.
وَمَنْ أَسَآءَ فَعَلَيْهَا
(and whosoever does evil, it is against himself.) means, the consequences of that will come back on him.
وَمَا رَبُّكَ بِظَلَّـمٍ لِّلْعَبِيدِ
(And your Lord is not at all unjust to (His) servants) means, He only punishes people for their sins, and He does not punish anyone except after establishing proof against him and sending a Messenger to him.
Knowledge of the Hour is with Allah Alone
Then Allah says:
إِلَيْهِ يُرَدُّ عِلْمُ السَّاعَةِ
(To Him is referred the knowledge of the Hour.) meaning, no one knows about that apart from Him. Muhammad, the leader of mankind, said to Jibril, who is one of the leading angels, when he asked him about the Hour:
(No fruit comes out of its sheath, nor does a female conceive nor brings forth (young), except by His knowledge.) means, all of that is known to Him, and nothing is hidden from your Lord the weight of a speck of dust on the earth or in the heaven. Allah says:
(And no aged man is granted a length of life nor is a part cut off from his life, but is in a Book. Surely, that is easy for Allah.) (35:11)
وَيَوْمَ يُنَادِيهِمْ أَيْنَ شُرَكَآئِى
(And on the Day when He will call unto them (saying): "Where are My (so-called) partners'') means, on the Day of Resurrection, Allah will call out to the idolators before all of creation and say, "Where are My partners whom you worshipped besides Me''
(They will say: "We inform You...'') means, `we tell You,'
مَا مِنَّا مِن شَهِيدٍ
(that none of us bears witness to it.) means, `not one of us will bear witness today that You have any partner.'