Surah Yunus 10:103

ثُمَّ نُنَجِّى رُسُلَنَا وَٱلَّذِينَ ءَامَنُوا۟ ۚ كَذَٰلِكَ حَقًّا عَلَيْنَا نُنجِ ٱلْمُؤْمِنِينَ

Then We will save Our messengers and those who have believed. Thus, it is an obligation upon Us that We save the believers.

Translation: Saheeh International

Tafsir

Then We shall deliver nunajjī the imperfect tense is being used to narrate a past situation Our messengers and the believers from the chastisement. In like manner to that deliverance it is incumbent upon Us to deliver the believers the Prophet s and his Companions when the time comes for chastising the idolaters.

Excerpt from Tafsir al-Jalalayn, commentary on 10:103, via Quran.com. The reader has the full commentary and 9 more tafsirs.