إِنَّا لَنَنصُرُ رُسُلَنَا وَٱلَّذِينَ ءَامَنُوا۟ فِى ٱلْحَيَوٰةِ ٱلدُّنْيَا وَيَوْمَ يَقُومُ ٱلْأَشْهَٰدُ
"We shall surely help Our messengers and those who believe, both in the life of this world and on the day the witnesses will stand."
ٱلْأَشْهَٰد — the plural of shāhid. The matter of witnessing was treated in verse 19 of the sūra (yaʿlamu khāʾinata'l-aʿyun); here the witnesses are named as the name of a day.
That the help is said to be "in the life of this world" as well is worth recording and it is confirmed by the sūra's own example: in the forty-fifth verse it was stated that the man who concealed his faith was protected (fa-waqāhu'llāhu sayyiʾāti mā makarū). That is, the promise stands as having been fulfilled once inside the sūra.
فَٱصْبِرْ إِنَّ وَعْدَ ٱللَّهِ حَقٌّ وَٱسْتَغْفِرْ لِذَنۢبِكَ وَسَبِّحْ بِحَمْدِ رَبِّكَ بِٱلْعَشِىِّ وَٱلْإِبْكَٰرِ — three commands: be patient, ask forgiveness, glorify.
بِٱلْعَشِىِّ وَٱلْإِبْكَٰرِ — in the late afternoon and at daybreak. The root ب-ك-ر was treated at al-Insān 76/25 and at al-Wāqiʿa 56/36 (abkār). By naming the two extreme times, everything between them is covered.